What is the time and space complexity of Implement sleep()?

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

Implement sleep()

Easy

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Solution Guide: Implement sleep()

Approach

Return a Promise that resolves after a setTimeout of the specified duration. This allows pausing async functions with await. Combine with a retry loop and exponential backoff to add resilience to network requests.

Complexity Analysis

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

Pattern

Sleep Utility

Why It Works

Wrapping setTimeout in a Promise converts a callback-based timer into an awaitable expression, enabling clean sequential delays in async/await code without nesting callbacks.

Updated Mar 2026