find :: Enumerable |
This is the short-circuit version of the full-search findAll. It just returns the first element that matches your predicate, or undefined if no element matches.
Examples
// An optimal exact prime detection method, slightly compacted. 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
$R(10,15).find(isPrime) // -> 11
[ 'hello', 'world', 'this', 'is', 'nice'].find(function(s) { return s.length <= 3; }) // -> 'is'
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Prototype API 1.5.0 - prototypejs.org