Array

Package	Top Level
Class	public dynamic class Array
Inheritance	Array Object

Language Version:

ActionScript 3.0

Runtime Versions:

AIR 1.0, Flash Player 9, Flash Lite 4

The Array class lets you access and manipulate arrays. Array indices are zero-based, which means that the first element in the array is [0], the second element is [1], and so on. To create an Array object, you use the new Array() constructor . Array() can also be invoked as a function. In addition, you can use the array access ([]) operator to initialize an array or access the elements of an array.

You can store a wide variety of data types in an array element, including numbers, strings, objects, and even other arrays. You can create a multidimensional array by creating an indexed array and assigning to each of its elements a different indexed array. Such an array is considered multidimensional because it can be used to represent data in a table.

Arrays are sparse arrays, meaning there might be an element at index 0 and another at index 5, but nothing in the index positions between those two elements. In such a case, the elements in positions 1 through 4 are undefined, which indicates the absence of an element, not necessarily the presence of an element with the value undefined.

Array assignment is by reference rather than by value. When you assign one array variable to another array variable, both refer to the same array:

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 var oneArray:Array = new Array("a", "b", "c");
 var twoArray:Array = oneArray; // Both array variables refer to the same array.
 twoArray[0] = "z";             
 trace(oneArray);               // Output: z,b,c.

Do not use the Array class to create associative arrays (also called hashes), which are data structures that contain named elements instead of numbered elements. To create associative arrays, use the Object class. Although ActionScript permits you to create associative arrays using the Array class, you cannot use any of the Array class methods or properties with associative arrays.

You can extend the Array class and override or add methods. However, you must specify the subclass as dynamic or you will lose the ability to store data in an array.

View the examples

More examples

Creating arrays
Inserting array elements
Retrieving values and removing array elements
Sorting an array
Querying an array
Extending the Array class
Arrays example: PlayList

Learn more

Working with arrays
Basics of arrays
Indexed arrays
Associative arrays
Multidimensional arrays
Cloning arrays

Related API Elements

[] (array access)
Object class

Public Properties

Hide Inherited Public Properties

Show Inherited Public Properties

	Property		Defined By
		constructor : Object A reference to the class object or constructor function for a given object instance.	Object
		length : uint A non-negative integer specifying the number of elements in the array.	Array

Public Methods

Hide Inherited Public Methods

Show Inherited Public Methods

	Method		Defined By
		Array(... values) Lets you create an array that contains the specified elements.	Array
		Array(numElements:int = 0) Lets you create an array of the specified number of elements.	Array
		concat(... args):Array Concatenates the elements specified in the parameters with the elements in an array and creates a new array.	Array
		every(callback:Function, thisObject:* = null):Boolean Executes a test function on each item in the array until an item is reached that returns false for the specified function.	Array
		filter(callback:Function, thisObject:* = null):Array Executes a test function on each item in the array and constructs a new array for all items that return true for the specified function.	Array
		forEach(callback:Function, thisObject:* = null):void Executes a function on each item in the array.	Array
		hasOwnProperty(name:String):Boolean Indicates whether an object has a specified property defined.	Object
		indexOf(searchElement:*, fromIndex:int = 0):int Searches for an item in an array by using strict equality (===) and returns the index position of the item.	Array
		insertAt(index:int, element:*):void Insert a single element into an array.	Array
		isPrototypeOf(theClass:Object):Boolean Indicates whether an instance of the Object class is in the prototype chain of the object specified as the parameter.	Object
		join(sep:*):String Converts the elements in an array to strings, inserts the specified separator between the elements, concatenates them, and returns the resulting string.	Array
		lastIndexOf(searchElement:*, fromIndex:int = 0x7fffffff):int Searches for an item in an array, working backward from the last item, and returns the index position of the matching item using strict equality (===).	Array
		map(callback:Function, thisObject:* = null):Array Executes a function on each item in an array, and constructs a new array of items corresponding to the results of the function on each item in the original array.	Array
		pop():* Removes the last element from an array and returns the value of that element.	Array
		propertyIsEnumerable(name:String):Boolean Indicates whether the specified property exists and is enumerable.	Object
		push(... args):uint Adds one or more elements to the end of an array and returns the new length of the array.	Array
		removeAt(index:int):* Remove a single element from an array.	Array
		reverse():Array Reverses the array in place.	Array
		setPropertyIsEnumerable(name:String, isEnum:Boolean = true):void Sets the availability of a dynamic property for loop operations.	Object
		shift():* Removes the first element from an array and returns that element.	Array
		slice(startIndex:int = 0, endIndex:int = 16777215):Array Returns a new array that consists of a range of elements from the original array, without modifying the original array.	Array
		some(callback:Function, thisObject:* = null):Boolean Executes a test function on each item in the array until an item is reached that returns true.	Array
		sort(... args):Array Sorts the elements in an array.	Array
		sortOn(fieldName:Object, options:Object = null):Array Sorts the elements in an array according to one or more fields in the array.	Array
		splice(startIndex:int, deleteCount:uint, ... values):Array Adds elements to and removes elements from an array.	Array
		toLocaleString():String Returns a string that represents the elements in the specified array.	Array
		toString():String Returns a string that represents the elements in the specified array.	Array
		unshift(... args):uint Adds one or more elements to the beginning of an array and returns the new length of the array.	Array
		valueOf():Object Returns the primitive value of the specified object.	Object

Public Constants

	Constant		Defined By
		CASEINSENSITIVE : uint = 1 [static] Specifies case-insensitive sorting for the Array class sorting methods.	Array
		DESCENDING : uint = 2 [static] Specifies descending sorting for the Array class sorting methods.	Array
		NUMERIC : uint = 16 [static] Specifies numeric (instead of character-string) sorting for the Array class sorting methods.	Array
		RETURNINDEXEDARRAY : uint = 8 [static] Specifies that a sort returns an array that consists of array indices.	Array
		UNIQUESORT : uint = 4 [static] Specifies the unique sorting requirement for the Array class sorting methods.	Array

Property Detail

length

property

length:uint

Language Version:

ActionScript 3.0

Runtime Versions:

AIR 1.0, Flash Player 9, Flash Lite 4

A non-negative integer specifying the number of elements in the array. This property is automatically updated when new elements are added to the array. When you assign a value to an array element (for example, my_array[index] = value), if index is a number, and index+1 is greater than the length property, the length property is updated to index+1.

Note: If you assign a value to the length property that is shorter than the existing length, the array will be truncated.

Implementation
public function get length():uint
public function set length(value:uint):void

Example ( How to use this example )

The following code creates an Array object names with the string element Bill. It then uses the push() method to add another string element Kyle. The length of the array, as determined by the length property, was one element before the use of push() and is two elements after push() is called. Another string, Jeff, is added to make the length of names three elements. The shift() method is then called twice to remove Bill and Kyle, making the final array of length one.

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var names:Array = new Array("Bill");
names.push("Kyle");
trace(names.length); // 2

names.push("Jeff");
trace(names.length); // 3

names.shift();
names.shift();
trace(names.length); // 1

Constructor Detail

()

Constructor

public function Array(... values)

Language Version:

ActionScript 3.0

Runtime Versions:

AIR 1.0, Flash Player 9, Flash Lite 4

Lets you create an array that contains the specified elements. You can specify values of any type. The first element in an array always has an index (or position) of 0.

Note: This class shows two constructor entries because the constructor accepts variable types of arguments. The constructor behaves differently depending on the type and number of arguments passed, as detailed in each entry. ActionScript 3.0 does not support method or constructor overloading.

Parameters

... values — A comma-separated list of one or more arbitrary values.

Note: If only a single numeric parameter is passed to the Array constructor, it is assumed to specify the array's length property.

Throws

RangeError — The argument is a number that is not an integer greater than or equal to 0.

More examples

Creating an Array instance

Related API Elements

[] array access
Array.length

Example ( How to use this example )

The following example creates a new Array object with an initial length of 3, populates the array with the string elements one, two, and three, and then converts the elements to a string.

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package {
    import flash.display.Sprite;

    public class Array_Array_3 extends Sprite {

        public function Array_Array_3() {
            var myArr:Array = new Array("one", "two", "three");
            trace(myArr.length); // 3
            trace(myArr);          // one,two,three
        }
    }
}

Array

()

Constructor

public function Array(numElements:int = 0)

Language Version:

ActionScript 3.0

Runtime Versions:

AIR 1.0, Flash Player 9, Flash Lite 4

Lets you create an array of the specified number of elements. If you don't specify any parameters, an array containing 0 elements is created. If you specify a number of elements, an array is created with numElements number of elements.

Note: This class shows two constructor method entries because the constructor accepts variable types of arguments. The constructor behaves differently depending on the type and number of arguments passed, as detailed in each entry. ActionScript 3.0 does not support method or constructor overloading.

Parameters

numElements:int (default = 0) — An integer that specifies the number of elements in the array.

Throws

RangeError — The argument is a number that is not an integer greater than or equal to 0.

More examples

Creating an Array instance

Related API Elements

[] array access
Array.length

Example ( How to use this example )

The following example creates the Array object myArr with no arguments and an initial length of 0:

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package {
    import flash.display.Sprite;

    public class Array_Array extends Sprite {

        public function Array_Array() {
            var myArr:Array = new Array();
            trace(myArr.length); // 0
        }
    }
}

The following example creates an Array object with 5 initial elements, with a length of 5, and populates the first element with the string "one", and adds the string element "six" to the end of the array by using the push() method:

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package {
    import flash.display.Sprite;

    public class Array_Array_2 extends Sprite {

        public function Array_Array_2() {
            var myArr:Array = new Array(5);
            trace(myArr.length); // 5
            myArr[0] = "one";
            myArr.push("six");
            trace(myArr);         // one,,,,,six
            trace(myArr.length); // 6
        }
    }
}

Method Detail

concat

()

method

AS3 function concat(... args):Array

Language Version:

ActionScript 3.0

Runtime Versions:

AIR 1.0, Flash Player 9, Flash Lite 4

Concatenates the elements specified in the parameters with the elements in an array and creates a new array. If the parameters specify an array, the elements of that array are concatenated. If you don't pass any parameters, the new array is a duplicate (shallow clone) of the original array.

Parameters

... args — A value of any data type (such as numbers, elements, or strings) to be concatenated in a new array.

Returns

Array — An array that contains the elements from this array followed by elements from the parameters.

More examples

Querying an array

Example ( How to use this example )

The following code creates four Array objects:

The numbers array, which contains the numbers 1, 2, and 3.
The letters array, which contains the letters a, b, and c.
The numbersAndLetters array, which calls the concat() method to produce the array [1,2,3,a,b,c].
The lettersAndNumbers array, which calls the concat() method to produce the array [a,b,c,1,2,3].

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var numbers:Array = new Array(1, 2, 3);
var letters:Array = new Array("a", "b", "c");
var numbersAndLetters:Array = numbers.concat(letters);
var lettersAndNumbers:Array = letters.concat(numbers);

trace(numbers);       // 1,2,3
trace(letters);       // a,b,c
trace(numbersAndLetters); // 1,2,3,a,b,c
trace(lettersAndNumbers); // a,b,c,1,2,3

every

()

method

AS3 function every(callback:Function, thisObject:* = null):Boolean

Language Version:

ActionScript 3.0

Runtime Versions:

AIR 1.0, Flash Player 9, Flash Lite 4

Executes a test function on each item in the array until an item is reached that returns false for the specified function. You use this method to determine whether all items in an array meet a criterion, such as having values less than a particular number.

For this method, the second parameter, thisObject, must be null if the first parameter, callback, is a method closure. Suppose you create a function in a movie clip called me:

     function myFunction(obj:Object):void {
        //your code here
     }

Suppose you then use the every() method on an array called myArray:

     myArray.every(myFunction, me);

Because myFunction is a member of the Timeline class, which cannot be overridden by me, the Flash runtime will throw an exception. You can avoid this runtime error by assigning the function to a variable, as follows:

     var myFunction:Function = function(obj:Object):void {
         //your code here
     };
     myArray.every(myFunction, me);

Parameters

	`callback:Function` — The function to run on each item in the array. This function can contain a simple comparison (for example, `item < 20`) or a more complex operation, and is invoked with three arguments; the value of an item, the index of an item, and the Array object: function callback(item:*, index:int, array:Array):Boolean;

	`thisObject:*` (default = `null`) — An object to use as `this` for the function.

Returns

Boolean — A Boolean value of true if all items in the array return true for the specified function; otherwise, false.

Related API Elements

Array.some()

Example ( How to use this example )

The following example tests two arrays to determine whether every item in each array is a number. It also outputs the results of the test, showing that isNumeric is true for the first array and false for the second:

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package {
    import flash.display.Sprite;
    public class Array_every extends Sprite {
        public function Array_every() {
            var arr1:Array = new Array(1, 2, 4);
            var res1:Boolean = arr1.every(isNumeric);
            trace("isNumeric:", res1); // true
 
            var arr2:Array = new Array(1, 2, "ham");
            var res2:Boolean = arr2.every(isNumeric);
            trace("isNumeric:", res2); // false
        }
        private function isNumeric(element:*, index:int, arr:Array):Boolean {
            return (element is Number);
        }
    }
}

filter

()

method

AS3 function filter(callback:Function, thisObject:* = null):Array

Language Version:

ActionScript 3.0

Runtime Versions:

AIR 1.0, Flash Player 9, Flash Lite 4

Executes a test function on each item in the array and constructs a new array for all items that return true for the specified function. If an item returns false, it is not included in the new array.

For this method, the second parameter, thisObject, must be null if the first parameter, callback, is a method closure. Suppose you create a function in a movie clip called me:

     function myFunction(obj:Object):void {
        //your code here
     }

Suppose you then use the filter() method on an array called myArray:

 
     myArray.filter(myFunction, me);

     var myFunction:Function = function(obj:Object):void {
         //your code here
         };
     myArray.filter(myFunction, me);

Parameters

	`callback:Function` — The function to run on each item in the array. This function can contain a simple comparison (for example, `item < 20`) or a more complex operation, and is invoked with three arguments; the value of an item, the index of an item, and the Array object: function callback(item:*, index:int, array:Array):Boolean;

	`thisObject:*` (default = `null`) — An object to use as `this` for the function.

Returns

Array — A new array that contains all items from the original array that returned true.

Related API Elements

Array.map()

Example ( How to use this example )

The following example creates an array of all employees who are managers:

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package {
    import flash.display.Sprite;
    public class Array_filter extends Sprite {
        public function Array_filter() {
            var employees:Array = new Array();
            employees.push({name:"Employee 1", manager:false});
            employees.push({name:"Employee 2", manager:true});
            employees.push({name:"Employee 3", manager:false});
            trace("Employees:");
            employees.forEach(traceEmployee);
            
            var managers:Array = employees.filter(isManager);
            trace("Managers:");
            managers.forEach(traceEmployee);
        }
        private function isManager(element:*, index:int, arr:Array):Boolean {
            return (element.manager == true);
        }
        private function traceEmployee(element:*, index:int, arr:Array):void {
            trace("\t" + element.name + ((element.manager) ? " (manager)" : ""));
        }
    }
}

forEach

()

method

AS3 function forEach(callback:Function, thisObject:* = null):void

Language Version:

ActionScript 3.0

Runtime Versions:

AIR 1.0, Flash Player 9, Flash Lite 4

Executes a function on each item in the array.

For this method, the second parameter, thisObject, must be null if the first parameter, callback, is a method closure. Suppose you create a function in a movie clip called me:

     function myFunction(obj:Object):void {
        //your code here
     }

Suppose you then use the forEach() method on an array called myArray:

     myArray.forEach(myFunction, me);

     var myFunction:Function = function(obj:Object):void {
         //your code here
         };
     myArray.forEach(myFunction, me);

Parameters

	`callback:Function` — The function to run on each item in the array. This function can contain a simple command (for example, a `trace()` statement) or a more complex operation, and is invoked with three arguments; the value of an item, the index of an item, and the Array object: function callback(item:*, index:int, array:Array):void;

	`thisObject:*` (default = `null`) — An object to use as `this` for the function.

Example ( How to use this example )

The following example runs the trace() statement in the traceEmployee() function on each item in the array:

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package {
    import flash.display.Sprite;
    public class Array_forEach extends Sprite {
        public function Array_forEach() {
            var employees:Array = new Array();
            employees.push({name:"Employee 1", manager:false});
            employees.push({name:"Employee 2", manager:true});
            employees.push({name:"Employee 3", manager:false});
            trace(employees);
            employees.forEach(traceEmployee);
        }
        private function traceEmployee(element:*, index:int, arr:Array):void {
            trace(element.name + " (" + element.manager + ")");
        }
    }
}

The following example also runs the trace() statement in a slightly altered traceEmployee() function on each item in the array:

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package {
    import flash.display.Sprite;
    public class Array_forEach_2 extends Sprite {
        public function Array_forEach_2() {
            var employeeXML:XML = <employees>
                    <employee name="Steven" manager="false" />
                    <employee name="Bruce" manager="true" />
                    <employee name="Rob" manager="false" />
                </employees>;
            var employeesList:XMLList = employeeXML.employee;
            var employeesArray:Array = new Array();
            for each (var tempXML:XML in employeesList) {
                employeesArray.push(tempXML);
            }
            employeesArray.sortOn("@name");
            employeesArray.forEach(traceEmployee);
        }
        private function traceEmployee(element:*, index:Number, arr:Array):void {
            trace(element.@name + ((element.@manager == "true") ? " (manager)" : ""));
        }
    }
}

indexOf

()

method

AS3 function indexOf(searchElement:*, fromIndex:int = 0):int

Language Version:

ActionScript 3.0

Runtime Versions:

AIR 1.0, Flash Player 9, Flash Lite 4

Searches for an item in an array by using strict equality (===) and returns the index position of the item.

Parameters

	`searchElement:*` — The item to find in the array.

	`fromIndex:int` (default = `0`) — The location in the array from which to start searching for the item.

Returns

int — A zero-based index position of the item in the array. If the searchElement argument is not found, the return value is -1.

Related API Elements

Array.lastIndexOf()
=== (strict equality)

Example ( How to use this example )

The following example displays the position of the specified array:

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package {
    import flash.display.Sprite;
    public class Array_indexOf extends Sprite {
        public function Array_indexOf() {
            var arr:Array = new Array(123,45,6789);
            arr.push("123-45-6789");
            arr.push("987-65-4321");
            
            var index:int = arr.indexOf("123");
            trace(index); // -1
            
            var index2:int = arr.indexOf(123);
            trace(index2); // 0
        }
    }
}

insertAt

()

method

AS3 function insertAt(index:int, element:*):void

Language Version:

ActionScript 3.0

Runtime Versions:

Flash Player 19, AIR 19

Insert a single element into an array. This method modifies the array without making a copy.

Parameters

	`index:int` — An integer that specifies the position in the array where the element is to be inserted. You can use a negative integer to specify a position relative to the end of the array (for example, -1 is the last element of the array).

	`element:*`

join

()

method

AS3 function join(sep:*):String

Language Version:

ActionScript 3.0

Runtime Versions:

AIR 1.0, Flash Player 9, Flash Lite 4

Converts the elements in an array to strings, inserts the specified separator between the elements, concatenates them, and returns the resulting string. A nested array is always separated by a comma (,), not by the separator passed to the join() method.

Parameters

sep:* (default = NaN) — A character or string that separates array elements in the returned string. If you omit this parameter, a comma is used as the default separator.

Returns

String — A string consisting of the elements of an array converted to strings and separated by the specified parameter.

More examples

Querying an array

Related API Elements

String.split()

Example ( How to use this example )

The following code creates an Array object myArr with elements one, two, and three and then a string containing one and two and three using the join() method.

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var myArr:Array = new Array("one", "two", "three");
var myStr:String = myArr.join(" and ");
trace(myArr); // one,two,three
trace(myStr); // one and two and three

The following code creates an Array object specialChars with elements (, ), -, and a blank space and then creates a string containing (888) 867-5309. Then, using a for loop, it removes each type of special character listed in specialChars to produce a string (myStr) that contains only the digits of the phone number remaining: 888675309. Note that other characters, such as +, could have been added to specialChars and then this routine would work with international phone number formats.

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var phoneString:String = "(888) 867-5309";

var specialChars:Array = new Array("(", ")", "-", " ");
var myStr:String = phoneString;

var ln:uint = specialChars.length;
for(var i:uint; i < ln; i++) {
    myStr = myStr.split(specialChars[i]).join("");
}

var phoneNumber:Number = new Number(myStr);

trace(phoneString); // (888) 867-5309
trace(phoneNumber); // 8888675309

lastIndexOf

()

method

AS3 function lastIndexOf(searchElement:*, fromIndex:int = 0x7fffffff):int

Language Version:

ActionScript 3.0

Runtime Versions:

AIR 1.0, Flash Player 9, Flash Lite 4

Searches for an item in an array, working backward from the last item, and returns the index position of the matching item using strict equality (===).

Parameters

	`searchElement:*` — The item to find in the array.

	`fromIndex:int` (default = `0x7fffffff`) — The location in the array from which to start searching for the item. The default is the maximum value allowed for an index. If you do not specify `fromIndex`, the search starts at the last item in the array.

Returns

int — A zero-based index position of the item in the array. If the searchElement argument is not found, the return value is -1.

Related API Elements

Array.indexOf()
=== (strict equality)

Example ( How to use this example )

The following example displays the position of the specified array:

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package {
    import flash.display.Sprite;
    public class Array_lastIndexOf extends Sprite {
        public function Array_lastIndexOf() {
            var arr:Array = new Array(123,45,6789,123,984,323,123,32);
            
            var index:int = arr.indexOf(123);
            trace(index); // 0
            
            var index2:int = arr.lastIndexOf(123);
            trace(index2); // 6
        }
    }
}

map

()

method

AS3 function map(callback:Function, thisObject:* = null):Array

Language Version:

ActionScript 3.0

Runtime Versions:

AIR 1.0, Flash Player 9, Flash Lite 4

Executes a function on each item in an array, and constructs a new array of items corresponding to the results of the function on each item in the original array.

For this method, the second parameter, thisObject, must be null if the first parameter, callback, is a method closure. Suppose you create a function in a movie clip called me:

     function myFunction(obj:Object):void {
        //your code here
     }

Suppose you then use the map() method on an array called myArray:

     myArray.map(myFunction, me);

     var myFunction:Function = function(obj:Object):void {
         //your code here
         };
     myArray.map(myFunction, me);

Parameters

	`callback:Function` — The function to run on each item in the array. This function can contain a simple command (such as changing the case of an array of strings) or a more complex operation, and is invoked with three arguments; the value of an item, the index of an item, and the Array object: function callback(item:*, index:int, array:Array):String;

	`thisObject:*` (default = `null`) — An object to use as `this` for the function.

Returns

Array — A new array that contains the results of the function on each item in the original array.

Related API Elements

Array.filter()

Example ( How to use this example )

The following example changes all items in the array to use uppercase letters:

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package {
    import flash.display.Sprite;
    public class Array_map extends Sprite {
        public function Array_map() {
            var arr:Array = new Array("one", "two", "Three");
            trace(arr); // one,two,Three

            var upperArr:Array = arr.map(toUpper);
            trace(upperArr); // ONE,TWO,THREE
        }
        private function toUpper(element:*, index:int, arr:Array):String {
            return String(element).toUpperCase();
        }
    }
}

pop

()

method

AS3 function pop():*

Language Version:

ActionScript 3.0

Runtime Versions:

AIR 1.0, Flash Player 9, Flash Lite 4

Removes the last element from an array and returns the value of that element.

Returns

* — The value of the last element (of any data type) in the specified array.

More examples

Retrieving values and removing array elements

Related API Elements

Array.push()
Array.shift()
Array.unshift()

Example ( How to use this example )

The following code creates an Array object letters with elements a, b, and c. The last element (c) is then removed from the array using the pop() method and assigned to the String object letter.

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var letters:Array = new Array("a", "b", "c");
trace(letters); // a,b,c
var letter:String = letters.pop();
trace(letters); // a,b
trace(letter);     // c

push

()

method

AS3 function push(... args):uint

Language Version:

ActionScript 3.0

Runtime Versions:

AIR 1.0, Flash Player 9, Flash Lite 4

Adds one or more elements to the end of an array and returns the new length of the array.

Parameters

... args — One or more values to append to the array.

Returns

uint — An integer representing the length of the new array.

More examples

Inserting array elements

Related API Elements

Array.pop()
Array.shift()
Array.unshift()

Example ( How to use this example )

The following code creates an empty Array object letters and then populates the array with the elements a, b, and c using the push() method.

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var letters:Array = new Array();

letters.push("a");
letters.push("b");
letters.push("c");

trace(letters.toString()); // a,b,c

The following code creates an Array object letters, which is initially populated with the element a. The push() method is then used once to add the elements b and c to the end of the array, which is three elements after the push.

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var letters:Array = new Array("a");
var count:uint = letters.push("b", "c");

trace(letters); // a,b,c
trace(count);   // 3

removeAt

()

method

AS3 function removeAt(index:int):*

Language Version:

ActionScript 3.0

Runtime Versions:

Flash Player 19, AIR 19

Remove a single element from an array. This method modifies the array without making a copy.

Parameters

index:int — An integer that specifies the index of the element in the array that is to be deleted. You can use a negative integer to specify a position relative to the end of the array (for example, -1 is the last element of the array).

Returns

* — The element that was removed from the original array.

reverse

()

method

AS3 function reverse():Array

Language Version:

ActionScript 3.0

Runtime Versions:

AIR 1.0, Flash Player 9, Flash Lite 4

Reverses the array in place.

Returns

Array — The new array.

More examples

Sorting an array

Example ( How to use this example )

The following code creates an Array object letters with elements a, b, and c. The order of the array elements is then reversed using the reverse() method to produce the array [c,b,a].

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var letters:Array = new Array("a", "b", "c");
trace(letters); // a,b,c
letters.reverse();
trace(letters); // c,b,a

shift

()

method

AS3 function shift():*

Language Version:

ActionScript 3.0

Runtime Versions:

AIR 1.0, Flash Player 9, Flash Lite 4

Removes the first element from an array and returns that element. The remaining array elements are moved from their original position, i, to i-1.

Returns

* — The first element (of any data type) in an array.

More examples

Retrieving values and removing array elements

Related API Elements

Array.pop()
Array.push()
Array.unshift()

Example ( How to use this example )

The following code creates the Array object letters with elements a, b, and c. The shift() method is then used to remove the first element (a) from letters and assign it to the string firstLetter.

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var letters:Array = new Array("a", "b", "c");
var firstLetter:String = letters.shift();
trace(letters);     // b,c
trace(firstLetter); // a

slice

()

method

AS3 function slice(startIndex:int = 0, endIndex:int = 16777215):Array

Language Version:

ActionScript 3.0

Runtime Versions:

AIR 1.0, Flash Player 9, Flash Lite 4

Returns a new array that consists of a range of elements from the original array, without modifying the original array. The returned array includes the startIndex element and all elements up to, but not including, the endIndex element.

If you don't pass any parameters, the new array is a duplicate (shallow clone) of the original array.

Parameters

	`startIndex:int` (default = `0`) — A number specifying the index of the starting point for the slice. If `startIndex` is a negative number, the starting point begins at the end of the array, where -1 is the last element.

	`endIndex:int` (default = `16777215`) — A number specifying the index of the ending point for the slice. If you omit this parameter, the slice includes all elements from the starting point to the end of the array. If `endIndex` is a negative number, the ending point is specified from the end of the array, where -1 is the last element.

Returns

Array — An array that consists of a range of elements from the original array.

More examples

Inserting array elements

Example ( How to use this example )

The following code creates an Array object letters with elements [a,b,c,d,e,f]. The array someLetters is then created by calling the slice() method on elements one (b) through three (d), resulting in an array with elements b and c.

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var letters:Array = new Array("a", "b", "c", "d", "e", "f");
var someLetters:Array = letters.slice(1,3);

trace(letters);     // a,b,c,d,e,f
trace(someLetters); // b,c

The following code creates an Array object letters with elements [a,b,c,d,e,f].The array someLetters is then created by calling the slice() method on element two (c), resulting in an array with elements [c,d,e,f].

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var letters:Array = new Array("a", "b", "c", "d", "e", "f");
var someLetters:Array = letters.slice(2);

trace(letters);     // a,b,c,d,e,f
trace(someLetters); // c,d,e,f

The following code creates an Array object letters with elements [a,b,c,d,e,f]. The array someLetters is then created by calling the slice() method on the second to last element from the end (e), resulting in an array with elements e and f.

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var letters:Array = new Array("a", "b", "c", "d", "e", "f");
var someLetters:Array = letters.slice(-2);

trace(letters);     // a,b,c,d,e,f
trace(someLetters); // e,f

some

()

method

AS3 function some(callback:Function, thisObject:* = null):Boolean

Language Version:

ActionScript 3.0

Runtime Versions:

AIR 1.0, Flash Player 9, Flash Lite 4

Executes a test function on each item in the array until an item is reached that returns true. Use this method to determine whether any items in an array meet a criterion, such as having a value less than a particular number.

For this method, the second parameter, thisObject, must be null if the first parameter, callback, is a method closure. Suppose you create a function in a movie clip called me:

     function myFunction(obj:Object):void {
        //your code here
     }

Suppose you then use the some() method on an array called myArray:

     myArray.some(myFunction, me);

     var myFunction:Function = function(obj:Object):void {
         //your code here
         };
     myArray.some(myFunction, me);

Parameters

	`callback:Function` — The function to run on each item in the array. This function can contain a simple comparison (for example `item < 20`) or a more complex operation, and is invoked with three arguments; the value of an item, the index of an item, and the Array object: function callback(item:*, index:int, array:Array):Boolean;

	`thisObject:*` (default = `null`) — An object to use as `this` for the function.

Returns

Boolean — A Boolean value of true if any items in the array return true for the specified function; otherwise false.

Related API Elements

every()

Example ( How to use this example )

The following example displays which values are undefined:

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package {
    import flash.display.Sprite;
    public class Array_some extends Sprite {
        public function Array_some() {
            var arr:Array = new Array();
            arr[0] = "one";
            arr[1] = "two";
            arr[3] = "four";
            var isUndef:Boolean = arr.some(isUndefined);
            if (isUndef) {
                trace("array contains undefined values: " + arr);
            } else {
                trace("array contains no undefined values.");
            }
        }
        private function isUndefined(element:*, index:int, arr:Array):Boolean {
            return (element == undefined);
        }
    }
}

sort

()

method

AS3 function sort(... args):Array

Language Version:

ActionScript 3.0

Runtime Versions:

AIR 1.0, Flash Player 9, Flash Lite 4

Sorts the elements in an array. This method sorts according to Unicode values. (ASCII is a subset of Unicode.)

By default, Array.sort() works in the following way:

Sorting is case-sensitive (Z precedes a).
Sorting is ascending (a precedes b).
The array is modified to reflect the sort order; multiple elements that have identical sort fields are placed consecutively in the sorted array in no particular order.
All elements, regardless of data type, are sorted as if they were strings, so 100 precedes 99, because "1" is a lower string value than "9".

To sort an array by using settings that deviate from the default settings, you can either use one of the sorting options described in the sortOptions portion of the ...args parameter description, or you can create your own custom function to do the sorting. If you create a custom function, you call the sort() method, and use the name of your custom function as the first argument (compareFunction)

Parameters

... args — The arguments specifying a comparison function and one or more values that determine the behavior of the sort.

This method uses the syntax and argument order Array.sort(compareFunction, sortOptions) with the arguments defined as follows:

compareFunction - A comparison function used to determine the sorting order of elements in an array. This argument is optional. A comparison function should take two arguments to compare. Given the elements A and B, the result of compareFunction can have a negative, 0, or positive value:
- A negative return value specifies that A appears before B in the sorted sequence.
- A return value of 0 specifies that A and B have the same sort order.
- A positive return value specifies that A appears after B in the sorted sequence.
sortOptions - One or more numbers or defined constants, separated by the | (bitwise OR) operator, that change the behavior of the sort from the default. This argument is optional. The following values are acceptable for sortOptions:
- 1 or Array.CASEINSENSITIVE
- 2 or Array.DESCENDING
- 4 or Array.UNIQUESORT
- 8 or Array.RETURNINDEXEDARRAY
- 16 or Array.NUMERIC
For more information, see the Array.sortOn() method.

Returns

Array — The return value depends on whether you pass any arguments, as described in the following list:

If you specify a value of 4 or Array.UNIQUESORT for the sortOptions argument of the ...args parameter and two or more elements being sorted have identical sort fields, Flash returns a value of 0 and does not modify the array.
If you specify a value of 8 or Array.RETURNINDEXEDARRAY for the sortOptions argument of the ...args parameter, Flash returns a sorted numeric array of the indices that reflects the results of the sort and does not modify the array.
Otherwise, Flash returns nothing and modifies the array to reflect the sort order.

More examples

Sorting an array

Related API Elements

| (bitwise OR)
Array.sortOn()

Example ( How to use this example )

The following code creates the Array object vegetables with elements [spinach, green pepper, cilantro, onion, avocado]. The array is then sorted by the sort() method, which is called with no parameters. The result is vegetables sorted in alphabetical order ([avocado, cilantro, green pepper, onion, spinach]).

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var vegetables:Array = new Array("spinach",
                 "green pepper",
                 "cilantro",
                 "onion",
                 "avocado");

trace(vegetables); // spinach,green pepper,cilantro,onion,avocado
vegetables.sort();
trace(vegetables); // avocado,cilantro,green pepper,onion,spinach

The following code creates the Array object vegetables with elements [spinach, green pepper, Cilantro, Onion, and Avocado]. The array is then sorted by the sort() method, which is called with no parameters the first time; the result is [Avocado,Cilantro,Onion,green pepper,spinach]. Then sort() is called on vegetables again with the CASEINSENSITIVE constant as a parameter. The result is vegetables sorted in alphabetical order ([Avocado, Cilantro, green pepper, Onion, spinach]).

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var vegetables:Array = new Array("spinach",
                 "green pepper",
                 "Cilantro",
                 "Onion",
                 "Avocado");

vegetables.sort();
trace(vegetables); // Avocado,Cilantro,Onion,green pepper,spinach
vegetables.sort(Array.CASEINSENSITIVE);
trace(vegetables); // Avocado,Cilantro,green pepper,Onion,spinach

The following code creates the empty Array object vegetables, which is then populated through five calls to push(). Each time push() is called, a new Vegetable object is created by a call to the Vegetable() constructor, which accepts a String (name) and Number (price) object. Calling push() five times with the values shown results in the following array: [lettuce:1.49, spinach:1.89, asparagus:3.99, celery:1.29, squash:1.44]. The sort() method is then used to sort the array, resulting in the array [asparagus:3.99, celery:1.29, lettuce:1.49, spinach:1.89, squash:1.44].

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var vegetables:Array = new Array();
vegetables.push(new Vegetable("lettuce", 1.49));
vegetables.push(new Vegetable("spinach", 1.89));
vegetables.push(new Vegetable("asparagus", 3.99));
vegetables.push(new Vegetable("celery", 1.29));
vegetables.push(new Vegetable("squash", 1.44));

trace(vegetables);
// lettuce:1.49, spinach:1.89, asparagus:3.99, celery:1.29, squash:1.44

vegetables.sort();

trace(vegetables);
// asparagus:3.99, celery:1.29, lettuce:1.49, spinach:1.89, squash:1.44

//The following code defines the Vegetable class
class Vegetable {
    private var name:String;
    private var price:Number;

    public function Vegetable(name:String, price:Number) {
        this.name = name;
        this.price = price;
    }

    public function toString():String {
        return " " + name + ":" + price;
    }
}

The following example is exactly the same as the previous one, except that the sort() method is used with a custom sort function (sortOnPrice), which sorts according to price instead of alphabetically. Note that the new function getPrice() extracts the price.

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var vegetables:Array = new Array();
vegetables.push(new Vegetable("lettuce", 1.49));
vegetables.push(new Vegetable("spinach", 1.89));
vegetables.push(new Vegetable("asparagus", 3.99));
vegetables.push(new Vegetable("celery", 1.29));
vegetables.push(new Vegetable("squash", 1.44));

trace(vegetables);
// lettuce:1.49, spinach:1.89, asparagus:3.99, celery:1.29, squash:1.44

vegetables.sort(sortOnPrice);

trace(vegetables);
// celery:1.29, squash:1.44, lettuce:1.49, spinach:1.89, asparagus:3.99

function sortOnPrice(a:Vegetable, b:Vegetable):Number {
    var aPrice:Number = a.getPrice();
    var bPrice:Number = b.getPrice();

    if(aPrice > bPrice) {
        return 1;
    } else if(aPrice < bPrice) {
        return -1;
    } else  {
        //aPrice == bPrice
        return 0;
    }
}

// The following code defines the Vegetable class and should be in a separate package.
class Vegetable {
    private var name:String;
    private var price:Number;

    public function Vegetable(name:String, price:Number) {
        this.name = name;
        this.price = price;
    }

    public function getPrice():Number {
        return price;
    }

    public function toString():String {
        return " " + name + ":" + price;
    }
}

The following code creates the Array object numbers with elements [3,5,100,34,10]. A call to sort() without any parameters sorts alphabetically, producing the undesired result [10,100,3,34,5]. To properly sort numeric values, you must pass the constant NUMERIC to the sort() method, which sorts numbers as follows: [3,5,10,34,100].

Note: The default behavior of the sort() function is to handle each entity as a string. If you use the Array.NUMERIC argument, the Flash runtime attempts to convert any non-numeric values to integers for sorting purposes. If it fails, the runtime throws an error. For example, the runtime can successfully convert a String value of "6" to an integer, but will throw an error if it encounters a String value of "six".

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var numbers:Array = new Array(3,5,100,34,10);

trace(numbers); // 3,5,100,34,10
numbers.sort();
trace(numbers); // 10,100,3,34,5
numbers.sort(Array.NUMERIC);
trace(numbers); // 3,5,10,34,100

sortOn

()

method

AS3 function sortOn(fieldName:Object, options:Object = null):Array

Language Version:

ActionScript 3.0

Runtime Versions:

AIR 1.0, Flash Player 9, Flash Lite 4

Sorts the elements in an array according to one or more fields in the array. The array should have the following characteristics:

The array is an indexed array, not an associative array.
Each element of the array holds an object with one or more properties.
All of the objects have at least one property in common, the values of which can be used to sort the array. Such a property is called a field.

If you pass multiple fieldName parameters, the first field represents the primary sort field, the second represents the next sort field, and so on. Flash sorts according to Unicode values. (ASCII is a subset of Unicode.) If either of the elements being compared does not contain the field that is specified in the fieldName parameter, the field is assumed to be set to undefined, and the elements are placed consecutively in the sorted array in no particular order.

By default, Array.sortOn() works in the following way:

Sorting is case-sensitive (Z precedes a).
Sorting is ascending (a precedes b).
The array is modified to reflect the sort order; multiple elements that have identical sort fields are placed consecutively in the sorted array in no particular order.
Numeric fields are sorted as if they were strings, so 100 precedes 99, because "1" is a lower string value than "9".

Flash Player 7 added the options parameter, which you can use to override the default sort behavior. To sort a simple array (for example, an array with only one field), or to specify a sort order that the options parameter doesn't support, use Array.sort().

To pass multiple flags, separate them with the bitwise OR (|) operator:

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     my_array.sortOn(someFieldName, Array.DESCENDING | Array.NUMERIC);

Flash Player 8 added the ability to specify a different sorting option for each field when you sort by more than one field. In Flash Player 8 and later, the options parameter accepts an array of sort options such that each sort option corresponds to a sort field in the fieldName parameter. The following example sorts the primary sort field, a, using a descending sort; the secondary sort field, b, using a numeric sort; and the tertiary sort field, c, using a case-insensitive sort:

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     Array.sortOn (["a", "b", "c"], [Array.DESCENDING, Array.NUMERIC, Array.CASEINSENSITIVE]);

Note: The fieldName and options arrays must have the same number of elements; otherwise, the options array is ignored. Also, the Array.UNIQUESORT and Array.RETURNINDEXEDARRAY options can be used only as the first element in the array; otherwise, they are ignored.

Parameters

fieldName:Object — A string that identifies a field to be used as the sort value, or an array in which the first element represents the primary sort field, the second represents the secondary sort field, and so on.

options:Object (default = null) — One or more numbers or names of defined constants, separated by the bitwise OR (|) operator, that change the sorting behavior. The following values are acceptable for the options parameter:

Array.CASEINSENSITIVE or 1
Array.DESCENDING or 2
Array.UNIQUESORT or 4
Array.RETURNINDEXEDARRAY or 8
Array.NUMERIC or 16

Code hinting is enabled if you use the string form of the flag (for example, DESCENDING) rather than the numeric form (2).

Returns

Array — The return value depends on whether you pass any parameters:

If you specify a value of 4 or Array.UNIQUESORT for the options parameter, and two or more elements being sorted have identical sort fields, a value of 0 is returned and the array is not modified.
If you specify a value of 8 or Array.RETURNINDEXEDARRAY for the options parameter, an array is returned that reflects the results of the sort and the array is not modified.
Otherwise, nothing is returned and the array is modified to reflect the sort order.

More examples

Sorting an array
Querying an array

Related API Elements

| (bitwise OR)
Array.sort()

Example ( How to use this example )

The following code creates an empty Array object vegetables and the array is then populated using five calls to push(). Each time push() is called, a new Vegetable object is created by calling the Vegetable() constructor, which accepts a String (name) and Number (price) object. Calling push() five times with the values shown results in the following array: [lettuce:1.49, spinach:1.89, asparagus:3.99, celery:1.29, squash:1.44]. The sortOn() method is then used with the name parameter to produce the following array: [asparagus:3.99, celery:1.29, lettuce:1.49, spinach:1.89, squash:1.44]. The sortOn() method is then called again with the price parameter, and the NUMERIC and DESCENDING constants to produce an array sorted by numbers in descending order: [asparagus:3.99, spinach:1.89, lettuce:1.49, squash:1.44, celery:1.29].

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var vegetables:Array = new Array();
vegetables.push(new Vegetable("lettuce", 1.49));
vegetables.push(new Vegetable("spinach", 1.89));
vegetables.push(new Vegetable("asparagus", 3.99));
vegetables.push(new Vegetable("celery", 1.29));
vegetables.push(new Vegetable("squash", 1.44));

trace(vegetables);
// lettuce:1.49, spinach:1.89, asparagus:3.99, celery:1.29, squash:1.44

vegetables.sortOn("name");
trace(vegetables);
// asparagus:3.99, celery:1.29, lettuce:1.49, spinach:1.89, squash:1.44

vegetables.sortOn("price", Array.NUMERIC | Array.DESCENDING);
trace(vegetables);
// asparagus:3.99, spinach:1.89, lettuce:1.49, squash:1.44, celery:1.29

class Vegetable {
    public var name:String;
    public var price:Number;

    public function Vegetable(name:String, price:Number) {
        this.name = name;
        this.price = price;
    }

    public function toString():String {
        return " " + name + ":" + price;
    }
}

The following code creates an empty Array object records and the array is then populated using three calls to push(). Each time push() is called, the strings name and city and a zip number are added to records. Three for loops are used to print the array elements. The first for loop prints the elements in the order in which they were added. The second for loop is run after records has been sorted by name and then city using the sortOn() method. The third for loop produces different output because records is re-sorted by city then by name.

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var records:Array = new Array();
records.push({name:"john", city:"omaha", zip:68144});
records.push({name:"john", city:"kansas city", zip:72345});
records.push({name:"bob", city:"omaha", zip:94010});

for(var i:uint = 0; i < records.length; i++) {
    trace(records[i].name + ", " + records[i].city);
}
// Results:
// john, omaha
// john, kansas city
// bob, omaha

trace("records.sortOn('name', 'city');");
records.sortOn(["name", "city"]);
for(var i:uint = 0; i < records.length; i++) {
    trace(records[i].name + ", " + records[i].city);
}
// Results:
// bob, omaha
// john, kansas city
// john, omaha

trace("records.sortOn('city', 'name');");
records.sortOn(["city", "name"]);
for(var i:uint = 0; i < records.length; i++) {
    trace(records[i].name + ", " + records[i].city);
}
// Results:
// john, kansas city
// bob, omaha
// john, omaha

The following code creates an empty Array object users and the array is then populated using four calls to push(). Each time push() is called, a User object is created with the User() constructor and a name string and age uint are added to users. The resulting array set is [Bob:3,barb:35,abcd:3,catchy:4].

The array is then sorted in the following ways:

By name only, producing the array [Bob:3,abcd:3,barb:35,catchy:4]
By name and using the CASEINSENSITIVE constant, producing the array [abcd:3,barb:35,Bob:3,catchy:4]
By name and using the CASEINSENSITIVE and DESCENDING constants, producing the array [catchy:4,Bob:3,barb:35,abcd:3]
By age only, producing the array [abcd:3,Bob:3,barb:35,catchy:4]
By age and using the NUMERIC constant, producing the array [Bob:3,abcd:3,catchy:4,barb:35]
By age and using the DESCENDING and NUMERIC constants, producing the array [barb:35,catchy:4,Bob:3,abcd:3]

An array called indices is then created and assigned the results of a sort by age and using the NUMERIC and RETURNINDEXEDARRAY constants, resulting in the array [Bob:3,abcd:3,catchy:4,barb:35], which is then printed out using a for loop.

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class User {
    public var name:String;
    public var age:Number;
    public function User(name:String, age:uint) {
        this.name = name;
        this.age = age;
    }

    public function toString():String {
        return this.name + ":" + this.age;
    }
}

var users:Array = new Array();
users.push(new User("Bob", 3));
users.push(new User("barb", 35));
users.push(new User("abcd", 3));
users.push(new User("catchy", 4));

trace(users); // Bob:3,barb:35,abcd:3,catchy:4

users.sortOn("name");
trace(users); // Bob:3,abcd:3,barb:35,catchy:4

users.sortOn("name", Array.CASEINSENSITIVE);
trace(users); // abcd:3,barb:35,Bob:3,catchy:4

users.sortOn("name", Array.CASEINSENSITIVE | Array.DESCENDING);
trace(users); // catchy:4,Bob:3,barb:35,abcd:3

users.sortOn("age");
trace(users); // abcd:3,Bob:3,barb:35,catchy:4

users.sortOn("age", Array.NUMERIC);
trace(users); // Bob:3,abcd:3,catchy:4,barb:35

users.sortOn("age", Array.DESCENDING | Array.NUMERIC);
trace(users); // barb:35,catchy:4,Bob:3,abcd:3

var indices:Array = users.sortOn("age", Array.NUMERIC | Array.RETURNINDEXEDARRAY);
var index:uint;
for(var i:uint = 0; i < indices.length; i++) {
    index = indices[i];
    trace(users[index].name, ": " + users[index].age);
}

// Results:
// Bob : 3
// abcd : 3
// catchy : 4
// barb : 35

splice

()

method

AS3 function splice(startIndex:int, deleteCount:uint, ... values):Array

Language Version:

ActionScript 3.0

Runtime Versions:

AIR 1.0, Flash Player 9, Flash Lite 4

Adds elements to and removes elements from an array. This method modifies the array without making a copy.

Note: To override this method in a subclass of Array, use ...args for the parameters, as this example shows:

     public override function splice(...args) {
       // your statements here
     }

Parameters

	`startIndex:int` — An integer that specifies the index of the element in the array where the insertion or deletion begins. You can use a negative integer to specify a position relative to the end of the array (for example, -1 is the last element of the array).

	`deleteCount:uint` — An integer that specifies the number of elements to be deleted. This number includes the element specified in the `startIndex` parameter. If you do not specify a value for the `deleteCount` parameter, the method deletes all of the values from the `startIndex` element to the last element in the array. If the value is 0, no elements are deleted.

	`... values` — An optional list of one or more comma-separated values to insert into the array at the position specified in the `startIndex` parameter. If an inserted value is of type Array, the array is kept intact and inserted as a single element. For example, if you splice an existing array of length three with another array of length three, the resulting array will have only four elements. One of the elements, however, will be an array of length three.

Returns

Array — An array containing the elements that were removed from the original array.

More examples

Retrieving values and removing array elements

Example ( How to use this example )

The following code creates the Array object vegetables with the elements [spinach, green pepper, cilantro, onion, avocado]. The splice() method is then called with the parameters 2 and 2, which assigns cilantro and onion to the spliced array. The vegetables array then contains [spinach,green pepper,avocado]. The splice() method is called a second time using the parameters 1, 0, and the spliced array to assign [cilantro,onion] as the second element in vegetables.

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var vegetables:Array = new Array("spinach",
                 "green pepper",
                 "cilantro",
                 "onion",
                 "avocado");

var spliced:Array = vegetables.splice(2, 2);
trace(vegetables); // spinach,green pepper,avocado
trace(spliced);    // cilantro,onion

vegetables.splice(1, 0, spliced);
trace(vegetables); // spinach,cilantro,onion,green pepper,avocado

Notice that cilantro and onion trace out as if vegetables has 5 elements, even though it actually has four (and the second element is another array containing two elements). To add cilantro and onion individually, you would use:

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var vegetables:Array = new Array("spinach",
                 "green pepper",
                 "cilantro",
                 "onion",
                 "avocado");
 
 var spliced:Array = vegetables.splice(2, 2);
 trace(vegetables); // spinach,green pepper,avocado
 trace(spliced);    // cilantro,onion
 
 vegetables.splice(1, 0, "cilantro", "onion");
 trace(vegetables); // spinach,cilantro,onion,green pepper,avocado

toLocaleString

()

method

public function toLocaleString():String

Language Version:

ActionScript 3.0

Runtime Versions:

AIR 1.0, Flash Player 9, Flash Lite 4

Returns a string that represents the elements in the specified array. Every element in the array, starting with index 0 and ending with the highest index, is converted to a concatenated string and separated by commas. In the ActionScript 3.0 implementation, this method returns the same value as the Array.toString() method.

Returns

String — A string of array elements.

Related API Elements

Array.toString()

toString

()

method

public function toString():String

Language Version:

ActionScript 3.0

Runtime Versions:

AIR 1.0, Flash Player 9, Flash Lite 4

Returns a string that represents the elements in the specified array. Every element in the array, starting with index 0 and ending with the highest index, is converted to a concatenated string and separated by commas. To specify a custom separator, use the Array.join() method.

Returns

String — A string of array elements.

More examples

Querying an array

Related API Elements

String.split()
Array.join()

Example ( How to use this example )

The following code creates an Array, converts the values to strings, and stores them in the vegnums variable of the String data type.

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var vegetables:Array = new Array();
vegetables.push(1);
vegetables.push(2);
vegetables.push(3);
vegetables.push(4);
vegetables.push(5);
var vegnums:String = vegetables.toString();
trace(vegnums+",6");
// 1,2,3,4,5,6

unshift

()

method

AS3 function unshift(... args):uint

Language Version:

ActionScript 3.0

Runtime Versions:

AIR 1.0, Flash Player 9, Flash Lite 4

Adds one or more elements to the beginning of an array and returns the new length of the array. The other elements in the array are moved from their original position, i, to i+1.

Parameters

... args — One or more numbers, elements, or variables to be inserted at the beginning of the array.

Returns

uint — An integer representing the new length of the array.

More examples

Inserting array elements

Related API Elements

Array.pop()
Array.push()
Array.shift()

Example ( How to use this example )

The following code creates the empty Array object names. The strings Bill and Jeff are added by the push() method, and then the strings Alfred and Kyle are added to the beginning of names by two calls to the unshift() method.

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var names:Array = new Array();
names.push("Bill");
names.push("Jeff");

trace(names); // Bill,Jeff

names.unshift("Alfred");
names.unshift("Kyle");

trace(names); // Kyle,Alfred,Bill,Jeff

Constant Detail

CASEINSENSITIVE

Constant

public static const CASEINSENSITIVE:uint = 1

Language Version:

ActionScript 3.0

Runtime Versions:

AIR 1.0, Flash Player 9, Flash Lite 4

Specifies case-insensitive sorting for the Array class sorting methods. You can use this constant for the options parameter in the sort() or sortOn() method.

The value of this constant is 1.

Related API Elements

Array.sort()
Array.sortOn()

DESCENDING

Constant

public static const DESCENDING:uint = 2

Language Version:

ActionScript 3.0

Runtime Versions:

AIR 1.0, Flash Player 9, Flash Lite 4

Specifies descending sorting for the Array class sorting methods. You can use this constant for the options parameter in the sort() or sortOn() method.

The value of this constant is 2.

Related API Elements

Array.sort()
Array.sortOn()

NUMERIC

Constant

public static const NUMERIC:uint = 16

Language Version:

ActionScript 3.0

Runtime Versions:

AIR 1.0, Flash Player 9, Flash Lite 4

Specifies numeric (instead of character-string) sorting for the Array class sorting methods. Including this constant in the options parameter causes the sort() and sortOn() methods to sort numbers as numeric values, not as strings of numeric characters. Without the NUMERIC constant, sorting treats each array element as a character string and produces the results in Unicode order.

For example, given the array of values [2005, 7, 35], if the NUMERIC constant is not included in the options parameter, the sorted array is [2005, 35, 7], but if the NUMERIC constant is included, the sorted array is [7, 35, 2005].

This constant applies only to numbers in the array; it does not apply to strings that contain numeric data such as ["23", "5"].

The value of this constant is 16.

Related API Elements

Array.sort()
Array.sortOn()

RETURNINDEXEDARRAY

Constant

public static const RETURNINDEXEDARRAY:uint = 8

Language Version:

ActionScript 3.0

Runtime Versions:

AIR 1.0, Flash Player 9, Flash Lite 4

Specifies that a sort returns an array that consists of array indices. You can use this constant for the options parameter in the sort() or sortOn() method, so you have access to multiple views of the array elements while the original array is unmodified.

The value of this constant is 8.

Related API Elements

Array.sort()
Array.sortOn()

UNIQUESORT

Constant

public static const UNIQUESORT:uint = 4

Language Version:

ActionScript 3.0

Runtime Versions:

AIR 1.0, Flash Player 9, Flash Lite 4

Specifies the unique sorting requirement for the Array class sorting methods. You can use this constant for the options parameter in the sort() or sortOn() method. The unique sorting option terminates the sort if any two elements or fields being sorted have identical values.

The value of this constant is 4.

Related API Elements

Array.sort()
Array.sortOn()

Examples How to use this example

ArrayExample.as

The following example creates a new Array object myArr with no arguments and an initial length of 0:

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package {
    import flash.display.Sprite;

    public class ArrayExample extends Sprite {
        public function ArrayExample() {
            var myArr:Array = new Array();
            trace(myArr.length); // 0
        }
    }
}

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Array - AS3

Classes x

length

Array

Array

concat

every

filter

forEach

indexOf

insertAt

join

lastIndexOf

map

pop

push

removeAt

reverse

shift

slice

some

sort

sortOn

splice

toLocaleString

toString

unshift

CASEINSENSITIVE

DESCENDING

NUMERIC

RETURNINDEXEDARRAY

UNIQUESORT