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indexOf()  String  instance method

Description

Returns the index value for the first occurence of the specified string from the specified starting index.

  • Returns -1 if the specified string value is not found.

Syntax


Signature Description
aString.indexOf(searchValue[, fromIndex])Returns the index value for the first occurence of the specified string from the specified starting index.

Parameters


Parameter Description
searchValueA string value.
fromIndexAn integer between 0 and the length of the string.

Examples

The code below creates a string of the alphabet and returns starting index for specified string value.


// Create alphabet string varible.
var theAlphabet = 'abcdefghijklmnopqrstuvwxyz';
// Return index of first occurence of search string.
alert(theAlphabet.indexOf('jkl'));

Press the button below to action the above code:

Related Tutorials

JavaScript Basic Tutorials - Lesson 8 - Strings



  

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