wiki/content/20200923153425-number.md

date	id	title
2020-09-23	adb898a3-6623-4bd5-92e6-408287d8cb31	JavaScript Number library

ES6

.EPSILON

Compares floating point numbers with a tolerance for rounding errors.

.isInteger(num)

console.log(Number.isInteger(1.05)) // false
console.log(Number.isInteger(1)) // true
console.log(Number.isInteger(-3.1)) // false
console.log(Number.isInteger(-3)) // true

.isNaN

Checks whether num is the value NaN. In contrast to the global function isNaN(), it doesn’t coerce its argument to a number and is therefore safer for non-numbers:

console.log(isNaN('???')) // true
console.log(Number.isNaN('???')) // false

.isFinite

Determines whether the passed value is a finite number

console.log(Number.isFinite(Infinity)) // false
console.log(Number.isFinite(123)) // true