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@ -155,7 +155,7 @@ We can avoid it by switching to `WeakMap` instead:
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```js
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```js
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// 📁 visitsCount.js
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// 📁 visitsCount.js
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let visitsCountMap = new WeakMap(); // map: user => visits count
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let visitsCountMap = new WeakMap(); // weakmap: user => visits count
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// increase the visits count
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// increase the visits count
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function countUser(user) {
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function countUser(user) {
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