JavaScript Number Object

Number constants and functions for converting and testing numbers.

Constants

Constant	Definition	Value
Number.EPSILON	Smallest possible difference between 2 different JavaScript numbers	\(2.220446049250313 \times 10^{-16}\)
Number.MAX_SAFE_INTEGER	Biggest safe JavaScript integer	\(2^{53} - 1\)
Number.MAX_VALUE	Biggest possible number	\(1.7976931348623157 \times 10^{308}\)
Number.MIN_SAFE_INTEGER	Smallest safe JavaScript integer	\(-(2^{53} - 1)\)
Number.MIN_VALUE	Smallest possible number bigger than 0	\(5 \times 10^{-324}\)
Number.NaN	Not a number	NaN
Number.NEGATIVE_INFINITY	Negative infinity	-Infinity
Number.POSITIVE_INFINITY	Positive infinity	Infinity

Functions

Function	Definition	Example
Number.isNaN(number)	Checks if argument is NaN	Number.isNaN('abc')
Number.isFinite(number)	Checks if argument is not Infinity or -Infinity	Number.isFinite(5)
Number.isInteger(number)	Checks if argument is an integer	Number.isInteger(3)
Number.isSafeInteger(number)	Checks if argument is a safe integer	Number.isSafeInteger(2 ** 53 - 1)
Number.parseFloat(number)	Same as parseFloat	Number.parseFloat('1.2') == 1.2
Number.parseInt(number)	Same as parseInt	Number.parseInt('1.2') == 1