MACROMEDIA FLASH 8-LEARNING ACTIONSCRIPT 2.0 IN FLASH

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464 Working with Text and Strings

Converting and concatenating strings

You can use the toString() method to convert many objects to strings. Most built-in objects

have a

toString() method for this purpose:

var n:Number = 0.470;

trace(typeof(n.toString())); // string

When you use the addition (+) operator with a combination of string and nonstring instances,

you don’t need to use the

toString() method. For details on concatenation, see the second

procedure in this section.

The

toLowerCase() method and the toUpperCase() method convert alphabetical characters

in the string to lowercase and uppercase, respectively. The following example demonstrates

how to convert a string from lowercase to uppercase characters.

To convert a string from lowercase to uppercase:

1. Create a new Flash document and save it as convert.fla.

2. Type the following code on Frame 1 of the Timeline:

var myStr:String = "Dr. Bob Roberts, #9.";

trace(myStr.toLowerCase()); // dr. bob roberts, #9.

trace(myStr.toUpperCase()); // DR. BOB ROBERTS, #9.

trace(myStr); // Dr. Bob Roberts, #9.

Save the Flash document and select Control > Test Movie.

myStr = myStr.toUpperCase();

When you concatenate strings, you take two strings and join them sequentially into one

string. For example, you can use the addition (

+) operator to concatenate two strings. The

next example shows you how to concatenate two strings.

To concatenate two strings:

1. Create a new Flash document and save it as concat.fla.

2. Add the following code to Frame 1 of the Timeline:

var str1:String = "green";

var str2:String = str1 + "ish";

trace(str2); // greenish

var str3:String = "yellow";

str3 += "ish";

trace(str3); // yellowish

NOTE

After these methods are executed, the source string remains unchanged. To

transform the source string, use the following:

MACROMEDIA FLASH 8-LEARNING ACTIONSCRIPT 2.0 IN FLASH - Page 464