JavaScript index Property: Array Object

Last update on August 19 2022 21:51:08 (UTC/GMT +8 hours)

Description

The index property is a read-only property. It contains the position of a regular expression match within a string.

Version

Implemented in JavaScript 1.2

Syntax

array.index

Example:

In the following web document a regular expression string that contains the search string 'fox'. The match() method is used to find the regular expression within the string 'str1'. The index property is used to get the position of the word 'fox' within the string 'str1'

HTML Code

<!DOCTYPE html>
<html lang="en">
<head><meta charset="utf8" />
<title>JavaScript Array object - index Property example</title>
<style type="text/css">h1 {color:red}
</style></head>
<body>
<h1>JavaScript Array Object : index property</h1>
<script src="array-index-example1.js"></script>
</body>
</html>

JS Code

var mymatch='fox';
var str1= "The quick brown fox jumps over the lazy dog.";
var myArray = str1.match(mymatch);

var newParagraph = document.createElement("p");
var newText = document.createTextNode('Original String : '+str1); 
newParagraph.appendChild(newText);
document.body.appendChild(newParagraph); 
var newParagraph1 = document.createElement("p"); 
var newText1 = document.createTextNode("The word 'fox' was found at position : "+myArray.index); 
newParagraph1.appendChild(newText1);
document.body.appendChild(newParagraph1);

View the example in the browser

Practice the example online

JavaScript Array object - index Property example
See also:

JavaScript Core objects, methods, properties.

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