find
find(iterator) -> firstElement | undefined
Finds the first element for which the iterator returns true
. Convenience alias for detect
, but constitutes the preferred (more readable) syntax.
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'