sabiwara
Cmp - Semantic comparison and sorting
Seeing several threads about semantic comparison recently motivated me to release this project I’ve been working on:
https://github.com/sabiwara/cmp
Instead of the built-in comparison operator, Enum.sort/1, Enum.max/1… which are based on structural comparison and would happily compare/sort anything, Cmp will make sure these types are compatible and compare them semantically:
iex> Cmp.gt?(~D[2020-03-02], ~D[2019-06-06])
true
iex> Cmp.sort([~D[2019-01-01], ~D[2020-03-02], ~D[2019-06-06]])
[~D[2019-01-01], ~D[2019-06-06], ~D[2020-03-02]]
iex> Cmp.lte?(2, "1")
** (Cmp.TypeError) Failed to compare incompatible types - left: 2, right: "1"
Design goals
- Fast and well-optimized - the overhead should be quite small over built-in equivalents. See the
benchmarks/folder for more details. - No need to require macros, plain functions
- Easily extensible through the
Cmp.Comparableprotocol - Robust and well-tested (both unit and property-based)
Feedback welcome 
Most Liked Responses
sabiwara
Cmp 0.1.2 got released and adds Cmp.sort_by/2, Cmp.max_by/2, and Cmp.min_by/2 (equivalents of the enum functions of the same name). 
# structural comparison :(
iex> Enum.sort_by([%{date: ~D[2020-03-02]}, %{date: ~D[2019-06-06]}], & &1.date)
[%{date: ~D[2020-03-02]}, %{date: ~D[2019-06-06]}]
# semantic comparison :)
iex> Cmp.sort_by([%{date: ~D[2020-03-02]}, %{date: ~D[2019-06-06]}], & &1.date)
[%{date: ~D[2019-06-06]}, %{date: ~D[2020-03-02]}]
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