Check if a number is odd

Test that an integer leaves a remainder when divided by 2.

JavaScript Version 1.0.0 · MIT · .md

function isOdd(n) { return n % 2 !== 0; }

Input & expected output

7

true

The edge case

-3

true

Know the limits

• Comparing with !== 0 handles negatives: -3 % 2 is -1.

The function above is the implementation used by the lab. The lab validates JSON types and caps size before execution; include equivalent validation when accepting untrusted input in your application.

Keep exploring

• Check whether all values are equal — Compare every item with the first using Object.is.
• Check whether an object is empty — Check for own enumerable string keys on a JSON object.
• Check whether an integer is even — Test parity for safe integers, including zero and negative values.