ActionScript for Flash MX: The Definitive Guide, Second Edition

String.charAt() Method

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ActionScript Language Reference

substr() Extract a substring from a string, based on a starting position and length.

substring() Extract a substring from a string, based on positive character positions only.

toLowerCase()

Return a lowercase version of a string.

toUpperCase()

Return an uppercase version of a string.

Description

The String class has several purposes:

• It allows us to access the

length property of strings and perform string-related opera-

tions, such as indexOf() and slice(). String objects are created (and eventually deleted)

automatically by the interpreter whenever a method is invoked on a primitive string

value.

• It can be used to convert a datum of any type to a string.

• It is used to access the fromCharCode() class method to create a new string, based on

specified Unicode code points.

• It can be used to create a String object, which contains a primitive string value in an

unnamed, internal property; however, there is little reason to do so.

In Flash 6, the performance (speed) of the String class methods is vastly improved over

Flash 5 performance. Flash Player 6 executes most String methods 50 to 1000 times faster

than Flash Player 5.

Usage

In practice, the String class constructor is used primarily to convert other datatypes to

strings. See ...