fraction.js

fraction.js is a fraction library written in javascript. With it you can comfortably create and manipulate fractions from Javascript.

Usage:

js> load('fraction-0.2.js'); // creates the global Fraction object

js> (new Fraction(7,3)).multiply(new Fraction(1,2))
1 1/6
js> (new Fraction(7,3)).divide(new Fraction(1,2))
4 2/3
js> (new Fraction(3,10)).add(new Fraction(5,9))
77/90
js> (new Fraction(0.25)).add(new Fraction(1,6))
5/12
js> (new Fraction(0.35)).subtract(new Fraction(1,4))
1/10

Download: fraction-0.2.js  2009-11-19

Demo: Recipesizer

License: MIT

Author: Erik Garrison

Notes

• Each Fraction object contains two members: denominator and numerator.
• Fractions are stored following all operations in normalized (numerator and denominator are divided by their greatest common factor).
• Fractions methods can take any type of number or other fractions objects.
• Fractions can be created from any kind of number (e.g. f = new Fraction(0.25) yields '1/4'), although rounding problems in Javascript may produce unintended results if fractions are initialized with the decimal equivalents of numbers such as 1/3, 1/9, etc.

Release History

0.2 2009-11-19 - Major cleanup, resolution of namespace issues.

0.1 2009-10-30 - Basic functionality. Issues with namespacing (use of array mixins, other problems).