The flat() and flatMap() methods
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Key takeaways
This article explains the functionality of JavaScript's flat() and flatMap() methods, covering their default depth, the use of flat(Infinity), how they handle holes in arrays, and how flatMap can serve as both a map and filter operation.
From the source
Learn how JavaScript's flat() and flatMap() work: default depth, flat(Infinity), dropping holes, and using flatMap as a combined map and filter.
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