Strings·medium 18 min 75 XP
Character Frequency
Return an object counting how many times each character appears in a string.
Examples
- characterFrequency("aab") → { a: 2, b: 1 }
Constraints
- Keep the required function name so the tests can find it
- Return a value instead of only logging it
- Do not mutate inputs unless the challenge asks you to
Character Frequency · editor
Code runs in an isolated Web Worker with a 3-second timeout — no DOM access, and it can never hang the page.