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Use Object.create(null) in SetCache.

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This commit is contained in:
John-David Dalton
2015-01-17 11:30:52 -08:00
committed by jdalton
parent f039d5bbcb
commit 70617be903
1 changed files with 9 additions and 11 deletions
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20
lodash.src.js
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@@ -756,6 +756,7 @@
/* Native method references for those with the same name as other `lodash` methods. */
var nativeIsArray = isNative(nativeIsArray = Array.isArray) && nativeIsArray,
nativeCreate = isNative(nativeCreate = Object.create) && nativeCreate,
nativeIsFinite = context.isFinite,
nativeKeys = isNative(nativeKeys = Object.keys) && nativeKeys,
nativeMax = Math.max,
@@ -1348,7 +1349,7 @@
function SetCache(values) {
var length = values ? values.length : 0;
this.data = { 'number': {}, 'set': new Set };
this.data = { 'hash': nativeCreate(null), 'set': new Set };
while (length--) {
this.push(values[length]);
}
@@ -1364,9 +1365,8 @@
* @returns {number} Returns `0` if `value` is found, else `-1`.
*/
function cacheIndexOf(cache, value) {
var type = typeof value,
data = cache.data,
result = type == 'number' ? data[type][value] : data.set.has(value);
var data = cache.data,
result = (typeof value == 'string' || isObject(value)) ? data.set.has(value) : data.hash[value];
return result ? 0 : -1;
}
@@ -1380,13 +1380,11 @@
* @param {*} value The value to cache.
*/
function cachePush(value) {
var data = this.data,
type = typeof value;
if (type == 'number') {
data[type][value] = true;
} else {
var data = this.data;
if (typeof value == 'string' || isObject(value)) {
data.set.add(value);
} else {
data.hash[value] = true;
}
}
@@ -3070,7 +3068,7 @@
* @param {Array} [values] The values to cache.
* @returns {null|Object} Returns the new cache object if `Set` is supported, else `null`.
*/
var createCache = !Set ? constant(null) : function(values) {
var createCache = !(nativeCreate && Set) ? constant(null) : function(values) {
return new SetCache(values);
};