Math Library 🧮

A math library containing properties and methods extended onto Number.prototype.

Golden Ratio

Number.goldenRatio is equal to 1.61803398875.

let num = Number.goldenRatio
num -> 1.61803398875

Round

The .round() method rounds the Number it is called on to the nearest whole number.

let num = 9.99
num.round() -> 10

Ceil

The .ceil() method rounds the Number it is called on to the higher whole number.

let num = 9.99
num.ceil() -> 10

Floor

The .floor() method rounds the Number it is called on to the lower whole number.

let num = 9.99
num.floor() -> 9

Pad

The .pad(x, y) method pads the Number it is called on with 0s in order to reach a total of digits (x, y) on each side of the decimal point. Returns a String.

let num = 9.99
34.801.pad(4,3) -> 0009.990

Degrees to Radians

The .degToRad() method returns a number's radian value. Accepts an optional argument to return a fixed amount of decimal numbers.

let num = 1
num.degToRad() -> 0.017453292519943295
num.degToRad(6) -> 0.017453

Radians to Degrees

The .radToDeg() method returns a number's degree value. Accepts an optional argument to return a fixed amount of decimal numbers.

let num = 1
num.radToDeg() ->
num.radToDeg(4) -> 57.2958

Dollar Amount

The .toDollars() method returns a numeric value formatted in USD.

let num = 1
num.toDollars() -> '$1.00'

Tax

The .tax(rate) method returns an amount with tax applied. Accepts optional argument (number) to calculate tax on amount. Without argument, tax rate defaults to .25.

let num = 1
num.tax(0.25) -> 1.25

Interest

The .interest(months, rate) method calculates interest over time.

let num = 1
num.interest(2, 16) -> 1.35

Mortgage

The .mortgage(years, rate) method returns the monthly mortgage payment of the number it is called on. Rate is interest rate, years is the amount of months to pay.

let num = 1
num.mortgage(10, .02) -> 1

Number to Hex

The .toHex() method returns a string containing the hexadecimal value of the number it is caled on. This method accepts an optional boolean argument to control the return of an octothorpe.

let num = 12
num.toHex() -> 'c'
num.toHex(true) -> '#c'