- Prototype Tutorial
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- Prototype - Enumerating
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- Prototype - JSON Support
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- Prototype - Expressing Ranges
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Prototype - Enumerable collect() Method
This method returns the results of applying the iterator to each element. This method is aliased as map() method.
The optional context parameter is what the iterator function will be bound to. If used, the this keyword inside the iterator will point to the object given by the argument.
Syntax
Iterator.collect([context]);
Return Value
Returns the results of applying the iterator to each element.
Example
<html>
<head>
<title>Prototype examples</title>
<script type = "text/javascript" src = "/javascript/prototype.js"></script>
<script>
function showResult() {
alert($R(1,5).collect(function(n) { return n * n; }) );
// This returns [1, 4, 9, 16, 25]
}
</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_enumerating.htm
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