What is the time and space complexity of Implement Array.map?

Time complexity: O(n). Space complexity: O(n).

Implement Array.map

Easy

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Solution Guide: Implement Array.map

Approach

Iterate through the array, apply the callback to each element with (value, index, array) arguments, and push each transformed result into a new array. The original array is never modified, preserving immutability.

Complexity Analysis

Time: O(n)
Space: O(n)

Pattern

Array Polyfill

Why It Works

Map creates a 1:1 transformation: every input element produces exactly one output element. The callback receives the current value, index, and original array, matching the native Array.prototype.map signature.

Updated Mar 2026