Arbitrary-precision arithmetic package for Elm

harfangk/elm-bignum

Elm library for arbitrary-precision decimal arithmetic that supports basic arithmetic, comparison, and rounding operations. I've forked this library from chain-partners/elm-bignum to update it as I've left that company in 2019 and no longer has access to the repository.

Design Goals

I initially wrote this library because I needed division operation of big decimal numbers. My goal was to write a library that:

1. Supports basic arithmetic operations
2. Has okay performance on browser

TODO

• Improve handling of fraction digits that are dropped off in moveZeroesToE function. They are currently being truncated but should be rounded.
• Get rid of Maybe.withDefault calls in Decimal module if possible.
• Improve performance, especially for division and square root operations.
• Add base conversion, including experimentation with changing default base to 2^26.
• Reimplement toString functions using Parser library.
• Find a better way to handle operations on last digits of Significand without relying on Integer.toString. Current implementation uses string manipulation using regular expression, as my initial implementation using recursion was crushingly slow.
• Implement IEEE 754-2019 specifications.