re: Sets in Javascript ES6 VIEW POST


Thanks for the post. The last example is a little confusing to me: When setting obj = null, and afterwards testing with set.has(obj), I would expect the set to return false even if it still contains {} (the object), as the test is equal to set.has(null) and you never added null to the set. Or am I wrong?


In that last example, we added a reference to the object, inside the variable obj. By setting obj to null, we eliminate the last reference to the object we stored in our set. Therefore, because this is a WeakSet, the object is garbage-collected in order to free memory.

Hope it's clear :)

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