What is the time and space complexity of Implement Memoize?

Time complexity: O(1) amortized for cache hits. Space complexity: O(n) where n is unique argument combinations.

Implement Memoize

Med

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Solution Guide: Implement Memoize

Approach

Return a wrapper that serializes arguments with JSON.stringify to create a cache key. Check if the key exists in a Map; if so, return the cached result. Otherwise, call the original function, store the result in the Map, and return it.

Complexity Analysis

Time: O(1) amortized for cache hits
Space: O(n) where n is unique argument combinations

Pattern

Memoization Pattern

Why It Works

JSON.stringify creates a deterministic string key from any combination of primitive arguments, and the Map provides O(1) lookup to avoid redundant computation on repeated calls.

Updated Mar 2026