What is the time and space complexity of Promise with Timeout?

Time complexity: O(1). Space complexity: O(1).

Promise with Timeout

Easy

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Solution Guide: Promise with Timeout

Approach

Create a timeout promise that rejects after the specified milliseconds, then race it against the original promise using Promise.race. Whichever settles first determines the outcome.

Complexity Analysis

Time: O(1)
Space: O(1)

Pattern

Promise Wrapper

Why It Works

Promise.race resolves or rejects as soon as either the real promise or the timeout promise settles, providing a simple deadline mechanism.

Updated Feb 2026