What is the time and space complexity of Implement Compose?

Time complexity: O(n) where n is the number of functions. Space complexity: O(1).

Implement Compose

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Solution Guide: Implement Compose

Approach

Accept an array of functions and return a new function that applies them right-to-left using reduceRight. The initial value is the input argument, and each function's return value becomes the input to the next.

Complexity Analysis

Time: O(n) where n is the number of functions
Space: O(1)

Pattern

Function Composition

Why It Works

reduceRight naturally expresses right-to-left evaluation, mirroring the mathematical composition f(g(h(x))) where the rightmost function is applied first.

Updated Feb 2026