Implement memoizeOne()

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Solution Guide: Implement memoizeOne()

Approach

Store only the most recent arguments and result. On each call, compare the current arguments against the last ones using strict equality. If they match, return the cached result; otherwise, recompute and update the cache with the new arguments and result.

Complexity Analysis

Time
O(k) where k is the number of arguments
Space
O(1)

Pattern

Single-Entry Cache

Why It Works

Keeping only the last call's result uses constant memory while still providing cache hits for the common case of consecutive identical calls, which is typical in React re-renders.

Updated Feb 2026