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Merge pull request #7331 from dev-drprasad/add-jsdoc-annotations-cached-merge 

📝 Add JSDoc annotations for cached merge util function
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Tobias Koppers 2018-05-25 12:00:17 +02:00 committed by GitHub
parent 70c608cb21 10c850de65
commit 2f3e7d4bd7
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1 changed files with 13 additions and 0 deletions
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13
lib/util/cachedMerge.js
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@ -6,6 +6,19 @@
const mergeCache = new WeakMap(); const mergeCache = new WeakMap();
/**
* Merges two given objects and caches the result to avoid computation if same objects passed as arguements again.
* @example
* // performs Object.assign(first, second), stores the result in WeakMap and returns result
* cachedMerge({a: 1}, {a: 2})
* {a: 2}
* // when same arguments passed, gets the result from WeakMap and returns it.
* cachedMerge({a: 1}, {a: 2})
* {a: 2}
* @param {object} first first object
* @param {object} second second object
* @returns {object} merged object of first and second object
*/
const cachedMerge = (first, second) => { const cachedMerge = (first, second) => {
let innerCache = mergeCache.get(first); let innerCache = mergeCache.get(first);
if (innerCache === undefined) { if (innerCache === undefined) {