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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

The value to check whether or not it is a number value.

Returns​

val is number

Example​

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