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. 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. Jan 16, 2026 · In this guide, we’ll explore all methods to flatten nested arrays in JavaScript, with a focus on deeply nested structures. We’ll use a practical 3D array example to demonstrate each technique, compare their use cases, and cover edge cases to ensure you’re prepared for any scenario.
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