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JS Array Methods Cheat Sheet: Map, Filter, Reduce Traps

This story is from 2026-10-20. It is preserved in the archive; the latest stories are on the live feed.

Direct answer: Use map to transform every element, filter to keep some, reduce to collapse many into one, and find / some / every to ask questions without… Since ES2023, toSorted, toReversed, toSpliced, and with return copies have been available, so you can drop the [...arr].sort() workaround. Run…

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  1. 2026-10-20 09:13 · DEV Community — AI
    JS Array Methods Cheat Sheet: Map, Filter, Reduce Traps

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