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

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

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>

Output


prototype_array_processing.htm

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