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Prototype Enumerable invoke() Method


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This method is an optimization for a common use-case of each() or collect() method. Invoking the same method, with the same potential arguments, for all the elements.

Syntax:

Iterator.invoke(methodName[, arg...]);

Return Value :

  • Returns the results of the method calls.

Example:

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

<script>

function showResult(){

  alert(['hello', 'world', 'cool!'].invoke('toUpperCase') );
  // Returns ['HELLO', 'WORLD', 'COOL!'];

  alert(['hello', 'world', 'cool!'].invoke('substring', 0, 3));
  // Returns ['hel', 'wor', 'coo']

}

</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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