Web Reference: Jul 10, 2025 · The flat() method of Array instances creates a new array with all sub-array elements concatenated into it recursively up to the specified depth. Dec 3, 2014 · There is now an ES proposal for an Array.prototype.flat method. It is currently at stage 3, meaning it's likely to be implemented by browsers soon (ish) and make it into the spec in its current form. Dec 9, 2024 · In this guide, we’ll implement the flat () method using an iterative approach with a stack, providing an efficient and readable solution. We can solve this problem by both iterative and recursive methods but here I am only implementing the iterative way of solving it.
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