This is a library for working with numbers of arbitrarily finite size.
Installation
Install precise
with Spago:
spago install precise
Quick start
JavaScript (and to some extension PureScript) has quite a few drawbacks when it comes to large numbers. For example, PureScript's Int
primitive is a member of the Bounded
typeclass, with top == 2 ^ 31  1
and bottom ==  (2 ^ 32)
.
The PureScript Number
primitive is not Bounded
in the same way; however, there are problems with manipulating largeenough Number
s:
> import Prelude
> let x = 900000000000000000.0
> :t x
Number
> x + 1.0 == x
true
> x + 1.0
900000000000000000
In this library, correctness is prioritized above all else:
> import Data.HugeNum
> let x = fromNumber 900000000000000000.0
> let y = fromNumber 1.0
> x + y == x
false
> x + y
HugeNum 900000000000000001.0
Addition is implemented using an elementaryschool method. Multiplication follows Karatsuba.
Documentation
precise
documentation is stored in a few places:
 Module documentation is published on Pursuit.
 Written documentation is kept in the docs directory.
 Usage examples can be found in the test suite.
If you get stuck, there are several ways to get help:
 Open an issue if you have encountered a bug or problem.
 Search or start a thread on the PureScript Discourse if you have general questions. You can also ask questions in the
#purescript
and#purescriptbeginners
channels on the Functional Programming Slack (invite link).
Contributing
You can contribute to precise
in several ways:

If you encounter a problem or have a question, please open an issue. We'll do our best to work with you to resolve or answer it.

If you would like to contribute code, tests, or documentation, please read the contributor guide. It's a short, helpful introduction to contributing to this library, including development instructions.

If you have written a library, tutorial, guide, or other resource based on this package, please share it on the PureScript Discourse! Writing libraries and learning resources are a great way to help this library succeed.