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Code Golf · #37 · 2026-05-11

Digital root

Difficulty 2/3 · 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 non-negative integer, keep summing its digits until you get a single digit. Return that digit.

Examples

f(38) → 2
f(123) → 6

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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