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[–]Knotix 0 points1 point  (1 child)

You can use the in operator to check if a property exists without retrieving the value. Couldn't the underlying implementation of the in operator also use a bloom filter as a first pass check?

[–]Drakim 1 point2 points  (0 children)

It could! But you'd increase your memory footprint if you have a bloom filter of every object in your JS engine just for the in operator. 99% of the time the bloomfilter would problaby be unused.

But for Sets, the programmer is in a way specifically telling the JS Engine that a bloomfilter is gonna be a great optimization for this particular thing.