October 2006
Beginner to intermediate
352 pages
9h 33m
English
Content preview from Learning JavaScript
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The String Object
The String object is probably
the most used of the built-in JavaScript objects. A new
String object can be explicitly
created using the new String constructor, passing the literal string
as a parameter:
var sObject = new String("Sample string");The String object has several
methods, some associated with working with HTML, and several not. One of
the non-HTML-specific methods, concat, takes two strings and returns a result
with the second string concatenated onto the first. Example 4-2
demonstrates how to create a String
object and use the concat
method.
Example 4-2. Creating a String object and calling the concat method
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<title>Exploring String</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
</head>
<body>
<script type="text/javascript">
//<![CDATA[
var sObj = new String( );
var sTxt = sObj.concat("This is a ", "new string");
document.writeln(sTxt);
//]]>
</script>
</body>
</html>There is no known limit to the number of strings you can
concatenate with the String concat method. However, I rarely use this
myself; I prefer the String
operators, such as the string concatenation operator (+).
The properties and methods available with the String object
are listed in Table
4-1.
Table 4-1. String Object methods
| Method | Description | Arguments |
|---|---|---|
valueOf
| Returns the string literal the String object is wrapping | None |
length ... |
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