← Practice
Objects·easy 10 min 50 XP

Object Property Counter

Return the number of own properties on an object.

Examples

  • countProperties({ a: 1, b: 2 }) → 2

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
Object Property Counter · editor

Code runs in an isolated Web Worker with a 3-second timeout — no DOM access, and it can never hang the page.