number number

@nick/is/number/number

isNumber

Signature

function isNumber(it: unknown): it is number;

Checks if the given value is a number. This includes all numbers, without distinguishing between NaN, Infinity, and other special values.

Parameters

Name	Info
it	The value to check.

Returns

true if the value is a number, false otherwise.

Category

Primitives

Examples

import { isNumber } from "jsr:@nick/is/number";

isNumber("123"); // false
isNumber(123); // true

import { isNumber } from "jsr:@nick/is/number";

const x: unknown = 123;
if (isNumber(x)) {
  console.log(x + 1);
  //          ^? const x: number
}