Implement Array.some

Easy
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Solution Guide: Implement Array.some

Approach

Iterate through the array and test each element with the callback. Return true immediately when any element passes the test, short-circuiting the remaining iterations. Return false only if every element fails the predicate.

Complexity Analysis

Time
O(n)
Space
O(1)

Pattern

Array Polyfill

Why It Works

Some implements existential quantification: it answers "does at least one element satisfy this condition?" Early return on the first truthy result makes it efficient for large arrays where a match is found early.

Updated Mar 2026