Web Reference: Dec 3, 2014 · Conclusion: To flatten an arbitrarily nested array in a functional way we just need a one-liner: const flatten = f => traverse(f) (concat) ([]);. All other involved functions are generic and have a whole range of other potential applications. 2 days ago · Working with arrays is common in JavaScript—but sometimes arrays can get nested, making them harder to use. That’s where array flattening comes in. In this blog, we’ll break down what nested arrays are, why flattening is useful, and explore different ways to flatten arrays step by step. Jul 10, 2025 · The flat() method removes empty slots if the array being flattened is sparse. For example, if depth is 1, both empty slots in the root array and in the first level of nested arrays are ignored, but empty slots in further nested arrays are preserved with the arrays themselves.
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