- Prototype Tutorial
- Prototype - Home
- Prototype - Short Overview
- Prototype - Useful Features
- Prototype - Utility Methods
- Prototype - Element Object
- Prototype - Number Processing
- Prototype - Strings Processing
- Prototype - Array Processing
- Prototype - Hash processing
- Prototype - Basic Object
- Prototype - Templating
- Prototype - Enumerating
- Prototype - Event Handling
- Prototype - Form Management
- Prototype - JSON Support
- Prototype - AJAX Support
- Prototype - Expressing Ranges
- Prototype - Periodical Execution
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Prototype - Enumerable find() Method
This method finds the first element for which the iterator returns true. This method is aliased as detect() method.
Syntax
Iterator.find([context]);
Return Value
Returns the first element for which the iterator returns true otherwise undefined.
Example
<html>
<head>
<title>Prototype examples</title>
<script type = "text/javascript" src = "/javascript/prototype.js"></script>
<script>
function isPrime(n) {
if (2 > n) return false;
if (0 == n % 2) return (2 == n);
for (var index = 3; n / index > index; index += 2)
if (0 == n % index) return false;
return true;
} // isPrime
function showResult() {
alert($R(10,15).find(isPrime) );
}
</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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