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Code Issues Releases Wiki Activity

Only lookup entry once on memoize cache hit

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Soreine
2016-11-01 13:19:39 +01:00
parent fea1e69e72
commit 136867d240
1 changed files with 11 additions and 1 deletions
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12
src/utils/memoize.js
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@@ -11,6 +11,13 @@ import { Map } from 'immutable'
const LEAF = {} const LEAF = {}
/**
* An unique value used to detect cache misses
*
* @type {Object}
*/
const NO_SET = {}
/** /**
* Memoize all of the `properties` on a `object`. * Memoize all of the `properties` on a `object`.
* *
@@ -31,7 +38,10 @@ function memoize(object, properties) {
const keys = [property, ...args, LEAF] const keys = [property, ...args, LEAF]
const cache = this.__cache = this.__cache || new Map() const cache = this.__cache = this.__cache || new Map()
if (cache.hasIn(keys)) return cache.getIn(keys) const cachedValue = cache.getIn(keys, NO_SET)
if (cachedValue !== NO_SET) {
return cachedValue
}
const value = original.apply(this, args) const value = original.apply(this, args)
this.__cache = cache.setIn(keys, value) this.__cache = cache.setIn(keys, value)