Skip to main content

isNumber()

isNumber(val): val is number

Determine if the given value is a number.

Includes Infinities and NaN, does not include strings that look like numbers

Parameters​

val​

unknown

Returns​

val is number

Example​

isNumber(1.23) // true
isNumber(Infinity) // true
isNumber(NaN) // true
isNumber('1.23') // false