@zerodep/is-number

A simple, performant utility to determine if a value is a finite number.

Full documentation is available at the zerodep.app page.

Examples

All @zerodep packages support both ESM and CJS.

import { isNumber } from '@zerodep/is-number';
// or
const { isNumber } = require('@zerodep/is-number');

Positive Response

isNumber(3.14); // true
isNumber(42); // true

Negative Response

isNumber(Infinity); // false - CAUTION
isNumber(Number.isNan); // false - CAUTION

isNumber(['a', 'b', 'c']); // false
isNumber(1000n); // false
isNumber(true); // false
isNumber(new Date()); // false
isNumber(''); // false
isNumber(new Error('message')); // false
isNumber(() => 'function'); // false
isNumber(
  new Map([
    ['a', 1],
    ['b', 2],
  ])
); // false
isNumber(null); // false
isNumber({ an: 'object' }); // false
isNumber(new Promise(() => {})); // false
isNumber(/[regex]+/gi); // false
isNumber(new Set([1, 2, 3])); // false
isNumber('a string'); // false
isNumber(Symbol()); // false
isNumber(new Int32Array(2)); // false
isNumber(undefined); // false