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Prototype indexOf() Method

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This method returns the position of the first occurrence of the argument within the array. If the argument doesn't exist in the array, returns -1.

NOTE: First index of the Array starts from zero.

Syntax:

array.indexOf(value)  ;

Return Value :

Example:

<html>
<head>
<title>Prototype examples</title>
<script type="text/javascript" 
   src="/javascript/prototype.js">
</script>
<script>

function showResult(){

   var arr = [3, 5, 6, 1, 20];
   alert("Found position : "  + arr.indexOf(6) );
}

</script>
</head>

<body>

  <p>Click the button to see the result.</p>
  <br />
  <br />
  <input type="button" value="Result" onclick="showResult();"/>

</body>
</html>

To understand it in better way you can Try it yourself.


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