Prototype Enumerable any() Method
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This method determines whether at least one element is boolean-equivalent to true, either directly or through computation by the provided iterator.
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.any([context]);
Return Value
- Returns boolean true value if atleast one value in the iterator is true.
Example
<html>
<head>
<title>Prototype examples</title>
<script type="text/javascript"
src="/javascript/prototype.js">
</script>
<script>
function showResult(){
alert( "[].any() : " + [].any() );
// false (empty arrays have no elements)
alert("$R(0, 2).any() : " + $R(0, 2).any() );
// true (on the second loop cycle, 1 is true-equivalent)
alert("[0, 1, 2].any() : " + [0, 1, 2].any() );
// true (with 1 and 2 loop cycle is true )
alert([9, 10, 15].any(function(n) { return n >= 10; }) );
// true (the iterator will return true more than 10 )
}
</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.
prototype_enumerating.htm
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