Proposal: New set of functions for Elixir.Range

[eksperimental]

I have created a set of functions for the range module.
Initially, I based my work in functions written by "jdl"
https://github.com/mykewould/crutches/blob/ddf5535d66601f9630bee1807ef38cb57f52b9b4/lib/crutches/range.ex

You can have a look at the module and tests:
https://github.com/eksperimental/elixir/blob/range/lib/elixir/lib/range.ex
https://github.com/eksperimental/elixir/blob/range/lib/elixir/test/elixir/range_test.exs

New functions are: congruent?/2, disjoint?2, contiguous?/2,
intersection/2, member?/2, overlaps?/2, reverse/1, size/1, sort/2,
subset?/2, to_list/2, union/2

Some functions have been taken from MapSet, and other apply exclusively
to Range.

Please let me know what you think of this.

And if there is an interest in adding this Elixir, I will have to
contact the author of the initial functions for release permission.

Cheers

[José Valim]

I am OK with adding more functions to Range but I would like to hear use cases. Come with a problem where you need those functions and start a discussion. Adding functions for the sake of the function itself is just adding complexity to the stdlib.

José Valim

www.plataformatec.com.br

Skype: jv.ptec

Founder and Director of R&D

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[Onorio Catenacci]

+1 José. A wise approach.  

[Matt Jonas]

Here's a use case... 

I have several "catalog" entries, each with a min & max. I'd like to determine the union of these entries. Converting them to Ranges and then getting the union of those would be an intuitive way.

While it's possible to use a MapSet, it feels wasteful as you have to load it up with every number in the range.

[José Valim]

Hi Matt, of those functions, which one is your use case about? Is it union exclusively?

And would the proposed behaviour of Range.union/2 of returning nil for non-overlapping ranges be desired? You would most likely lose that in those cases (or have to resort to a set anyway).

José Valim

www.plataformatec.com.br

Founder and 

Director of R&D

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