appendmap: Map with a Semigroup and Monoid instances delegating to Semigroup of the elements
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- appendmap-0.1.5.tar.gz [browse] (Cabal source package)
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| Versions [RSS] | 0.1.1, 0.1.2, 0.1.3, 0.1.4, 0.1.5 |
|---|---|
| Change log | ChangeLog.md |
| Dependencies | base (>=4.7 && <5), containers [details] |
| License | BSD-3-Clause |
| Copyright | 2018 Alexey Kotlyarov |
| Author | Alexey Kotlyarov |
| Maintainer | a@koterpillar.com |
| Category | Data Structures |
| Home page | https://github.com/koterpillar/appendmap#readme |
| Bug tracker | https://github.com/koterpillar/appendmap/issues |
| Source repo | head: git clone https://github.com/koterpillar/appendmap |
| Uploaded | by AlexeyKotlyarov at 2018-09-02T07:30:02Z |
| Distributions | LTSHaskell:0.1.5, NixOS:0.1.5, Stackage:0.1.5 |
| Reverse Dependencies | 3 direct, 0 indirect [details] |
| Downloads | 3506 total (18 in the last 30 days) |
| Rating | (no votes yet) [estimated by Bayesian average] |
| Your Rating | |
| Status | Docs available [build log] Last success reported on 2018-09-02 [all 1 reports] |
Readme for appendmap-0.1.5
[back to package description]appendmap
A Data.Map wrapper with a Semigroup and Monoid instances that delegate to
the individual keys.
import qualified Data.Map as Map
import Data.Map.Append
> one = AppendMap $ Map.fromList [(1, "hello"), (2, "goodbye")]
> two = AppendMap $ Map.fromList [(1, "world"), (3, "again")]
> unAppendMap (one <> two)
fromList [(1, "helloworld"), (2, "goodbye"), (3, "again")]
Motivation
Data.Map has a Semigroup instance that keeps the values from the first
argument in case of a key conflict:
import qualified Data.Map as Map
import Data.Map.Append
> Map.fromList [(1, "hello")] <> Map.fromList [(1, "goodbye")]
fromList [(1, "hello")]
A different instance has been suggested for a long time (1, 2), but this is a breaking change and hasn't happened yet (as of 2018-08).
Development
Source code is formatted with hindent then stylish-haskell.
Releasing
- Run
./bumpversion patch|minor|major. This will create a new version and push it to the repository to be released.