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Code Golf · #51 · 2026-05-25

Count vowels

Difficulty 1/3 · JavaScript

How to play

Write a JavaScript function body that passes all test cases using the fewest characters. Run against examples first, then submit for the full test suite. Eagle < Birdie < Par.

Given a lowercase string, return the number of vowels (a, e, i, o, u).

Examples

f("hello") → 2
f("aeiou") → 5

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Your code (function body — receives input)

function(input) { 0 chars
}

Write the shortest JavaScript function body that passes all tests · Back to hub