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. 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. Jul 23, 2025 · Merging or flattening an array of arrays in JavaScript involves combining multiple nested arrays into a single-level array. This process involves iterating through each nested array and appending its elements to a new array, resulting in a flattened structure.
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