Copyright ©

Prototype indexOf() Method

previous next


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.


array.indexOf(value)  ;

Return Value :


<title>Prototype examples</title>
<script type="text/javascript" 

function showResult(){

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



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


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

previous next

Copyright ©