Skip to content

shinuza/decimal-js

Folders and files

NameName
Last commit message
Last commit date

Latest commit

 

History

46 Commits
 
 
 
 
 
 
 
 
 
 

Repository files navigation

Decimal

Simple decimal arithmetic for the browser and node.js!

Why?

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 browser and I couldn't find a lightweight library to do it.

How to use?

In the browser

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

In node

npm install decimal

then in your program

var Decimal = require('decimal');

Examples

>>> 1.1 + 2.2
3.3000000000000003

>>> Decimal('1.1').add('2.2').toNumber()
3.3

>>> 4.01 * 2.01
8.060099999999998

>>> Decimal('4.01').mul('2.01').toNumber()
8.0601

>>> Decimal.mul('4.01', '2.01').toNumber()
8.0601

Can I help?

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 a way to simplify things you can send in a pull request.

Methods

Decimal(n)

Create a new Decimal from n. n can be a string, integer, or another Decimal.

.toString()

Returns the Decimal instance as a string.

.toNumber()

Turn a Decimal into a Number.

.add(n)

Return a new Decimal containing the instance value plus n.

.sub(n)

Return a new Decimal containing the instance value minus n.

.mul(n)

Return a new Decimal containing the instance value multiplied by n.

.div(n)

Return a new Decimal containing the instance value integrally divided by n.

About

Simple decimal arithmetic for the browser and node.js!

Resources

License

Stars

Watchers

Forks

Releases

No releases published

Packages

No packages published