What is the time and space complexity of Implement _.partial()?

Time complexity: O(1). Space complexity: O(n) where n is the preset argument count.

Implement _.partial()

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Solution Guide: Implement _.partial()

Approach

Return a new function that prepends the preset arguments to any later arguments, then calls the original function with the combined list. Extend with placeholder support by scanning preset arguments for a sentinel symbol and replacing those positions with later arguments in order.

Complexity Analysis

Time: O(1)
Space: O(n) where n is the preset argument count

Pattern

Partial Application

Why It Works

Closures capture the preset arguments so they persist across calls, and spread syntax cleanly concatenates preset and later arguments into a single invocation of the original function.

Updated Mar 2026