Check if a string contains whitespace

Test for any whitespace character.

JavaScript Version 1.0.0 · MIT · .md

function containsWhitespace(text) { return /\s/.test(text); }

Input & expected output

"ana @example.com"

true

The edge case

"ana@example.com"

false

Know the limits

• The original returned a function — which is always truthy — instead of a boolean. This version returns the test result.

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.