Repository files navigation

Simple decimal arithmetic for the browserand node.js!

Why don’t my numbers, like 0.1 + 0.2 add up to a nice round 0.3,and instead I get a weird result like 0.30000000000000004?Because internally, computers use a format (binary floating-point)that cannot accurately represent a number like 0.1, 0.2 or 0.3 at all.

Source :http://floating-point-gui.de/

I wrote this because I needed to do simple computation in the browserand I couldn't find a lightweight library to do it.

<script src="lib/decimal.js"></script>

npm install decimal

then in your program

var Decimal = require('decimal');

>>> 1.1 + 2.23.3000000000000003>>> Decimal('1.1').add('2.2').toNumber()3.3>>> 4.01 * 2.018.060099999999998>>> Decimal('4.01').mul('2.01').toNumber()8.0601>>> Decimal.mul('4.01', '2.01').toNumber()8.0601

Of course you can, I suck at math, and this implementation is very naive.If you are a math Guru and you see something wrong or away to simplify things you can send in a pull request.

Create a newDecimal fromn.n can be a string, integer, oranotherDecimal.

Returns theDecimal instance as a string.

Turn aDecimal into aNumber.

Return a newDecimal containing the instance value plusn.

Return a newDecimal containing the instance value minusn.

Return a newDecimal containing the instance value multiplied byn.

Return a newDecimal containing the instance value integrally divided byn.