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Add falsey value optimizations for baseDifference, baseFlatten, baseUniq, _.flatten, and _.uniq.

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John-David Dalton
2014-02-22 17:10:34 -08:00
parent d4fac798fc
commit c2b1d3b551
1 changed files with 18 additions and 6 deletions
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24
lodash.js
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@@ -1288,9 +1288,12 @@
* @returns {Array} Returns a new array of filtered values.
*/
function baseDifference(array, values) {
var length = array ? array.length : 0;
if (!length) {
return [];
}
var index = -1,
indexOf = getIndexOf(),
length = array ? array.length : 0,
result = [];
if (createCache && values && indexOf === baseIndexOf && values.length >= LARGE_ARRAY_SIZE) {
@@ -1702,9 +1705,12 @@
* @returns {Array} Returns a duplicate-value-free array.
*/
function baseUniq(array, isSorted, callback) {
var length = array ? array.length : 0;
if (!length) {
return [];
}
var index = -1,
indexOf = getIndexOf(),
length = array ? array.length : 0,
isLarge = createCache && !isSorted && indexOf === baseIndexOf && length >= LARGE_ARRAY_SIZE,
result = [];
@@ -2412,9 +2418,12 @@
* // => ['hoppy', 'baby puss', 'dino']
*/
function flatten(array, isShallow, callback, thisArg) {
var type = typeof isShallow;
var length = array ? array.length : 0;
if (!length) {
return [];
}
// juggle arguments
var type = typeof isShallow;
if (type != 'boolean' && isShallow != null) {
thisArg = callback;
callback = isShallow;
@@ -3090,9 +3099,12 @@
* // => [{ 'x': 1 }, { 'x': 2 }]
*/
function uniq(array, isSorted, callback, thisArg) {
var type = typeof isSorted;
var length = array ? array.length : 0;
if (!length) {
return [];
}
// juggle arguments
var type = typeof isSorted;
if (type != 'boolean' && isSorted != null) {
thisArg = callback;
callback = isSorted;