Weak maps in JavaScript - Basic JavaScript Fast (34)

Published: 08 October 2022
on channel: Begin Coding Fast

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In a weak map of JavaScript, when the key in object form is deleted outside the weak map, both the key and the corresponding value is also deleted in the weak map. Therefore, a weak map can save memory that an ordinary map cannot. In ordinary maps, both the key and value are still retained in the ordinary map when the key in object form is already deleted outside the map.

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