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Fix _.shuffle on small collections. [closes #609]

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John-David Dalton
2014-07-08 08:28:50 -07:00
parent 4ddc3b518b
commit b24b8315d3
2 changed files with 12 additions and 12 deletions
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15
lodash.js
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@@ -5242,19 +5242,16 @@
function shuffle(collection) { function shuffle(collection) {
collection = toIterable(collection); collection = toIterable(collection);
var index = 0, var index = -1,
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 rand = baseRandom(0, index);
rand = baseRandom(0, index - 1); if (index != rand) {
result[index] = result[rand];
result[index] = result[rand]; }
result[rand] = value; result[rand] = collection[index];
} }
return result; return result;
} }

9
test/test.js
View File

@@ -8907,9 +8907,12 @@
deepEqual(_.shuffle(object).sort(), array); deepEqual(_.shuffle(object).sort(), array);
}); });
test('should shuffle an object', 1, function() { test('should shuffle small collections', 1, function() {
var actual = _.shuffle(object); var actual = _.times(1000, function() {
deepEqual(actual.sort(), array); return _.shuffle([1, 2]);
});
deepEqual(_.sortBy(_.uniq(actual, String), '0'), [[1, 2], [2, 1]]);
}); });
test('should treat number values for `collection` as empty', 1, function() { test('should treat number values for `collection` as empty', 1, function() {