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Violet.Lee 2019-08-30 05:35:48 +09:00 • committed by GitHub
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1-js/05-data-types/08-weakmap-weakset/article.md
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@ -155,7 +155,7 @@ We can avoid it by switching to `WeakMap` instead:
```js ```js
// 📁 visitsCount.js // 📁 visitsCount.js
let visitsCountMap = new WeakMap(); // map: user => visits count let visitsCountMap = new WeakMap(); // weakmap: user => visits count
// increase the visits count // increase the visits count
function countUser(user) { function countUser(user) {
@ -164,7 +164,7 @@ function countUser(user) {
} }
``` ```
Now we don't have to clean `visitsCountMap`. After `john` object becomes unreachable by all means except as a key of `WeakMap`, it gets removed from memory, along with the information by that key from `WeakMap`. Now we don't have to clean `visitsCountMap`. After `john` object becomes unreachable by all means except as a key of `WeakMap`, it gets removed from memory, along with the information by that key from `WeakMap`.
## Use case: caching ## Use case: caching