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Optimize _.shuffle.

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John-David Dalton
2014-07-08 00:36:52 -07:00
parent 479a7e441d
commit 4ddc3b518b
1 changed files with 5 additions and 2 deletions
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7
lodash.js
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@@ -5242,13 +5242,16 @@
function shuffle(collection) { function shuffle(collection) {
collection = toIterable(collection); collection = toIterable(collection);
var index = -1, var index = 0,
length = collection.length, length = collection.length,
result = Array(length); result = Array(length);
if (length) {
result[index] = collection[index];
}
while (++index < length) { while (++index < length) {
var value = collection[index], var value = collection[index],
rand = baseRandom(0, index); rand = baseRandom(0, index - 1);
result[index] = result[rand]; result[index] = result[rand];
result[rand] = value; result[rand] = value;