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validateNumber javascript Code Snippet in 2024

mathintermediate

Last Updated: 13 May 2024

Checks if the given value is a number.

  • Use parseFloat() to try to convert n to a number.
  • Use !Number.isNaN() to check if num is a number.
  • Use Number.isFinite() to check if num is finite.
  • Use Number() and the loose equality operator (==) to check if the coercion holds.
const validateNumber = n => { const num = parseFloat(n); return !Number.isNaN(num) && Number.isFinite(num) && Number(n) == n; }
validateNumber('10'); // true validateNumber('a'); // false

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