3 Implement Array Prototype Flat - Latest Information & Updates 2026

Web Reference: There is already Array.prototype.flat () in JavaScript (ES2019), which reduces the nesting of Array. Please implement your own. const arr = [1, [2], [3, [4]]]; flat(arr) // [1, 2, 3, [4]] flat(arr, 1) // [1, 2, 3, [4]] flat(arr, 2) // [1, 2, 3, 4] follow up Are you able to solve it both recursively and iteratively? How do you handle sparse array? This feature is well established and works across many devices and browser versions. It’s been available across browsers since January 2020. 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.

YouTube Excerpt: This is a problem from bfe.dev: https://bigfrontend.dev/problem/

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