fractions

Fractions.js

A library to help do more precise fractional math

What do you mean? Multiply .1 by .2 in javascript and you'll get something around 0.020000000000000004, even though the correct answer is .2

You can read up more about it here.

How to set up

Node.js

Install

npm install fractions

Then in your program

var Fraction = require('fractions');

Browser

Download Fraction.js, and then link it in your HTML

<script src="Fraction.js"></script>

API

Create a fraction

There are multiple ways to create a fraction

var oneHalf = new Fraction(1,2);
var oneHalf = new Fraction(.5);
var oneHalf = new Fraction("1/2");
var oneHalf = new Fraction("1", "2")

Add two fractions

You can use Fraction.add(fraction1, fraction2) to add two fractions

var oneThird = new Fraction("1/3");
var fourThirds = new Fraction("4/3");
var fiveThirds = Fraction.add(oneThird, fourThirds);

You can also use Fraction.add() to add anything that can be converted into a fraction

var fiveThirds = Fraction.add("1/3", "4/3");

Another method of adding

var fiveThirds = new Fraction("1/3").add("4/3");

Subtract two fractions

var oneThird = Fraction.subtract("5/3", "4/3");

var oneThird = new Fraction("5/3").subtract("4/3");

Multiply two fractions

var oneFiftieth = Fraction.multiply(".2", ".1");

var oneFiftieth = new Fraction(".2").multiply(".1");

Divide two fractions

var oneFifth = Fraction.divide(".02", ".1");

var oneFifth = new Fraction(".02").divide(".1");

Compare two fractions

var oneFifth = new Fraction(1,5);
var oneOverFive = new Fraction("1/5");
oneFifth.equals(oneOverFive); //true

Compare to a number

var oneTenth = new Fraction(1,10);
oneTenth == .1 //true