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Add WeakMap resources (#1637)
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# Weak map
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# Weak map
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[WeakMap](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/WeakMap) is a Map-like collection of key/value pairs whose keys must be objects, it removes them once they become inaccessible by other means
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<ResourceGroupTitle>Free Content</ResourceGroupTitle>
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<BadgeLink colorScheme='yellow' badgeText='Read' href='https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/WeakMap'>WeakMap</BadgeLink>
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<BadgeLink colorScheme='yellow' badgeText='Read' href='https://javascript.info/weakmap-weakset'>WeakMap and WeakSet</BadgeLink>
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