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Optimize cacheIndexOf, cachePush, and isKeyable.

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This commit is contained in:
John-David Dalton
2015-10-03 16:27:21 -07:00
parent 5746169aec
commit 940559fc76
1 changed files with 21 additions and 3 deletions
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24
lodash.js
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@@ -1836,7 +1836,14 @@
* @returns {number} Returns `0` if `value` is found, else `-1`.
*/
function cacheIndexOf(cache, value) {
return cache.__data__.has(value) ? 0 : -1;
var map = cache.__data__;
if (isKeyable(value)) {
var data = map.__data__,
hash = typeof value == 'string' ? data.string : data.hash;
return hash[value] === HASH_UNDEFINED ? 0 : -1;
}
return map.has(value) ? 0 : -1;
}
/**
@@ -1848,7 +1855,16 @@
* @param {*} value The value to cache.
*/
function cachePush(value) {
this.__data__.set(value, true);
var map = this.__data__;
if (isKeyable(value)) {
var data = map.__data__,
hash = typeof value == 'string' ? data.string : data.hash;
hash[value] = HASH_UNDEFINED;
}
else {
map.set(value, HASH_UNDEFINED);
}
}
/*------------------------------------------------------------------------*/
@@ -4404,7 +4420,9 @@
* @returns {boolean} Returns `true` if `value` is suitable, else `false`.
*/
function isKeyable(value) {
return !(value === '__proto__' || isObject(value));
var type = typeof value;
return type == 'number' || type == 'boolean' ||
(type == 'string' && value !== '__proto__') || value == null;
}
/**