isNumber

Checks if the given argument is a number.

Use typeof to check if a value is classified as a number primitive. To safeguard against NaN, check if val === val (as NaN has a typeof equal to number and is the only value not equal to itself).

typescript

const isNumber = (val: any) => typeof val === "number" && val === val;

typescript

isNumber(1); // true
isNumber("1"); // false
isNumber(NaN); // false