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Chapter 6: ActionScript Core Classes
String class
Availability
Flash Player 5 (became a native object in Flash Player 6, which improved
performance significantly).
Description
The String class is a wrapper for the string primitive data type, and provides methods and
properties that let you manipulate primitive string value types. You can convert the value of any
object into a string using the
String()
function.
All the methods of the String class, except for
concat()
,
fromCharCode()
,
slice()
, and
substr()
, are generic, which means the methods call
toString()
before performing their
operations, and you can use these methods with other non-String objects.
Because all string indexes are zero-based, the index of the last character for any string
x
is
x.length - 1
.
You can call any of the methods of the String class using the constructor method
new String
or
using a string literal value. If you specify a string literal, the ActionScript interpreter automatically
converts it to a temporary String object, calls the method, and then discards the temporary String
object. You can also use the
String.length
property with a string literal.
Do not confuse a string literal with a String object. In the following example, the first line of code
creates the string literal
first_string
, and the second line of code creates the String object
second_string
:
var first_string:String = "foo"
var second_string:String = new String("foo")
Use string literals unless you specifically need to use a String object.
Method summary for the String class
Method
Description
String.charAt()
Returns the character at a specific location in a string.
String.charCodeAt()
Returns the value of the character at the specified index as a 16-bit
integer between 0 and 65535.
String.concat()
Combines the text of two strings and returns a new string.
String.fromCharCode()
Returns a string comprising the characters specified in the parameters.
String.indexOf()
Returns the position of the first occurrence of a specified substring.
String.lastIndexOf()
Returns the position of the last occurrence of a specified substring.
String.slice()
Extracts a section of a string and returns a new string.
String.split()
Splits a String object into an array of strings by separating the string
into substrings.
String.substr()
Returns a specified number of characters in a string, beginning at a
specified location.
CHAPTER 6
ActionScript Core Classes
Summary of Contents for FLEX-FLEX ACTIONSCRIPT LANGUAGE
Page 1: ...Flex ActionScript Language Reference...
Page 8: ......
Page 66: ...66 Chapter 2 Creating Custom Classes with ActionScript 2 0...
Page 76: ......
Page 133: ...break 133 See also for for in do while while switch case continue throw try catch finally...
Page 135: ...case 135 See also break default strict equality switch...
Page 146: ...146 Chapter 5 ActionScript Core Language Elements See also break continue while...
Page 808: ...808 Chapter 7 ActionScript for Flash...
Page 810: ...810 Appendix A Deprecated Flash 4 operators...
Page 815: ...Other keys 815 Num Lock 144 186 187 _ 189 191 192 219 220 221 222 Key Key code...
Page 816: ...816 Appendix B Keyboard Keys and Key Code Values...
Page 822: ...822 Index...