lastIndexOf() String instance method getterS2C Home
« Globals « String « lastIndexOf()
Description
Returns the index value for the last occurence of the specified string from the specified starting index.
- Returns -1 if the specified string value is not found.
Syntax
| Signature | Description |
|---|---|
aString.lastIndexOf(searchValue[, fromIndex]) | Returns the index value for the first occurence of the specified string from the specified starting index. |
Parameters
| Parameter | Description |
|---|---|
searchValue | A string value. |
fromIndex | An integer between 0 and length of the string that defaults to the length of the string.
|
Examples
The code below creates a repeating string and searches backwards through it as both the searchValue and fromIndex parameters are specified.
// Create alphabet string variable.
var repeatingString = 'abcdefabcdefabcdefabcdef';
// Return index of last occurrence of search string.
alert(repeatingString.lastIndexOf('ab', 14));
Related Tutorials
JavaScript Basic Tutorials - Lesson 8 - Strings
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