Concatenation of strings means taking two strings and joining
them sequentially into one. For example, you can use the
+
operator
to concatenate two strings:
var str1:String = "green";
var str2:String = "ish";
var str3:String = str1 + str2; // str3 == "greenish"
You can also use the
+=
operator to the produce
the same result, as the following example shows:
var str:String = "green";
str += "ish"; // str == "greenish"
Additionally, the String class includes a
concat()
method,
which can be used as follows:
var str1:String = "Bonjour";
var str2:String = "from";
var str3:String = "Paris";
var str4:String = str1.concat(" ", str2, " ", str3);
// str4 == "Bonjour from Paris"
If you use the
+
operator (or the
+=
operator)
with a String object and an object that is
not
a string,
ActionScript automatically converts the nonstring object to a String
object in order to evaluate the expression, as shown in this example:
var str:String = "Area = ";
var area:Number = Math.PI * Math.pow(3, 2);
str = str + area; // str == "Area = 28.274333882308138"
However, you can use parentheses for grouping to provide context
for the
+
operator, as the following example shows:
trace("Total: $" + 4.55 + 1.45); // output: Total: $4.551.45
trace("Total: $" + (4.55 + 1.45)); // output: Total: $6
