Please stop saying “performant.” First of all, it doesn’t mean what you think it means. It means “functioning well or as expected” but it’s become a fad to use it as this article does, to say “how fast is it?”

The article itself has a decent point: JavaScript hashes, a/k/a objects, can look up a member, insert a member, or determine if something is a member in O(1) time (roughly, amortized and assuming few collisions) while Arrays are often O(n). But “performant” doesn’t mean any of that.

Say “how does it perform” or “what’s the performance” or even — horrors! — stick to simple English and say “How fast is it?”

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