Implement Array.every

Easy
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Solution Guide: Implement Array.every

Approach

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

Complexity Analysis

Time
O(n)
Space
O(1)

Pattern

Array Polyfill

Why It Works

Every implements universal quantification: it answers "do all elements satisfy this condition?" Early return on the first falsy result avoids unnecessary work, and it is the logical complement of some.

Updated Feb 2026