Mathlib

This is just a collection of various math functions that are used frequently in projects

the functions:

• round(num, place)
  Rounds to the the 1's place unless specified otherwise

  round(5.8) // => 6
  round(524, 10) // => 520
  round(73, 5) // => 75

• floor(num, place)
  floors to the 1's place unless specified otherwise

  floor(5.8) // => 5
  floor(524, 10) // => 520
  floor(73, 5) // => 70

• ceil(num, place)
  ceils to the 1's place unless specified otherwise

  ceil(5.8) // => 6
  ceil(524, 10) // => 530
  ceil(73, 5) // => 75

• pad(num, before, after)
  pads with 0's before and after, returns a string. Num must have a decimal point

  pad(12.3, 3, 5) // => "012.30000"
  pad(203.0, 1, 1) // => "203.0"

• degToRad(degrees)
  converts degrees to radians

  degToRad(90) // => PI/2 as a decimal

• radToDeg(radians)
  converts radians to degrees

  radToDeg(Math.PI / 2) // => 90

• toDollars(amount)
  takes a number and converts it into a string in american currency

  toDollars(23) // => "$23.00"
  toDollars(8.75) // => "$8.75"
  toDollars(4.628) // => "$4.63"

• tax(amount, rate)
  returns the total amount of tax

  tax(100, 5) // => 5

• withTax(amount, rate)
  returns the total of the tax and the amound

  tax(100, 5) // => 105

• calculateInterest(total, years, rate)
  calculates the total cost given the total amount of money, the number of years, and the rate at which it's taxed. Returns formated as money

  calculateInterest(100, 5, 2) // => "$110.00"

• mortage(principle, number_of_payments, intrest)
  calculates total payment of a mortage given the principle charge, the total number of payments on said charge, and the amount of intrest. returns formated as money

  mortage(120000, 120, 3) // => "$360000.00"

• intToHex(integer)
  converts and int to a hex value

  intToHex(3735928559) // => "#deadbeef"