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Optimize _.sample.

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John-David Dalton
2013-09-08 01:14:42 -05:00
parent 692521c49d
commit 1460e46d1f
1 changed files with 6 additions and 3 deletions
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9
lodash.js
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@@ -3888,11 +3888,14 @@
* // => [3, 1] * // => [3, 1]
*/ */
function sample(collection, n, guard) { function sample(collection, n, guard) {
if (!isArray(collection)) { var length = collection ? collection.length : 0;
collection = toArray(collection); if (typeof length != 'number') {
collection = values(collection);
} else if (support.unindexedChars && isString(collection)) {
collection = collection.split('');
} }
if (n == null || guard) { if (n == null || guard) {
return collection[random(collection.length - 1)]; return collection[random(length - 1)];
} }
var result = shuffle(collection); var result = shuffle(collection);
result.length = nativeMin(nativeMax(0, n), result.length); result.length = nativeMin(nativeMax(0, n), result.length);