Number
Number type, constants, and parsing functions.
Number.isFinite()
Determines whether the passed value is a finite number, returning true for finite numbers and false for Infinity, -Infinity, NaN, and non-numbers.
Number.isFinite(value) Number.isInteger()
Determines whether the passed value is an integer, returning true only for finite integer values.
Number.isInteger(value) Number.isNaN()
Determine whether the passed value is NaN (Not-a-Number).
isNaN(number) Number.prototype.toFixed()
Format a number using a fixed number of decimal places.
toFixed(digits) Number.prototype.toPrecision()
Format a number using a specified total precision.
toPrecision(precision) Number.prototype.toString()
Convert a number to a string, optionally using a radix.
toString(radix)