## haskell-frex

By yallop

## partial-semigroup

A partial binary associative operator (appendMaybe :: a → a → Maybe a) (by typeclasses)

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haskell-frex | partial-semigroup | |
---|---|---|

1 | 0 | |

19 | 14 | |

- | - | |

0.0 | 4.8 | |

11 months ago | 2 months ago | |

Haskell | Haskell | |

MIT License | GNU General Public License v3.0 or later |

The number of

For example, an activity of

**mentions**indicates the total number of mentions that we've tracked plus the number of user suggested alternatives.**Stars**- the number of stars that a project has on GitHub.**Growth**- month over month growth in stars.**Activity**is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.For example, an activity of

**9.0**indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.## haskell-frex

Posts with mentions or

**reviews of haskell-frex**. We have used some of these posts to build our list of alternatives and similar projects.-
Is there an automatic approach to program optimization?
The work that is closest to real is [FREX](https://www.cl.cam.ac.uk/~jdy22/papers/partially-static-data-as-free-extension-of-algebras.pdf) which has an [implementation in metaocaml](https://github.com/yallop/metaocaml-frex) and an [implementation in Haskell](https://github.com/yallop/haskell-frex). As far as I know [Ohad Kammar](http://denotational.co.uk/) is also working on an [Idris](https://www.idris-lang.org/) version.

## partial-semigroup

Posts with mentions or

**reviews of partial-semigroup**. We have used some of these posts to build our list of alternatives and similar projects.
We haven't tracked posts mentioning partial-semigroup yet.

Tracking mentions began in Dec 2020.

## What are some alternatives?

When comparing haskell-frex and partial-semigroup you can also consider the following projects:

**multi-instance**
- Multiple typeclass instances, selected by explicit application of a phantom type parameter

**csa**
- Connection-set algebra library

**semilattices**
- join and meet semilattices, lower and upper bounds.

**sparse-tensor**
- typesafe implementation of tensor algebra in Haskell

**tropical-geometry**
- Haskell Library for Tropical Geometry

**acts**
- Haskell library for semigroup actions and torsors

**interval-algebra**
- A Haskell implementation of Allen's interval algebra

**group-theory**
- The theory of groups

**involutive-semigroups**
- Semigroups with involution.

**ParsleyHaskell**
- Reimplementation of Parsley in Haskell, with improvements