IvanR
A library to work with tagged tuples.
Provides functions to work with chains of tags for nested tuples.
Some of the supported operations are: add/remove tag chain to a core value, converting a tuple to list or to map and back. The latter one is useful for converting tuples to/from JSON representation.
iex> use TaggedTuple
...> core_value = 12
...> :tag --- core_value
{:tag, 12}
...> tagged_tuple = :a --- :tag --- :chain --- core_value
{:a, {:tag, {:chain, 12}}}
...> match?(:a --- :tag --- _tail, tagged_tuple)
true
iex> {chain, value} = TaggedTuple.split({:a, {:tag, {:chain, 2}}})
...> chain == {:a, {:tag, :chain}}
...> value == 2
iex> TaggedTuple.tag(2, {:a, {:tag, :chain}})
{:a, {:tag, {:chain, 2}}}
iex> TaggedTuple.to_map({:a, {:tag, {:chain, 2}}})
%{a: %{tag: %{chain: 2}}}
iex> TaggedTuple.from_map(%{a: %{tag: %{chain: 2}}})
{:a, {:tag, {:chain, 2}}}
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dimitarvp
Super great work, man. I like the
tagged_tuplelibrary a lot, already used it in a small hobby project as a test!One thing that might be worth mentioning: would you consider making the custom syntax (the 3 dashes:
---) optional and injectable throughuseor a configuration setting? Not critical but I’d like to be able to not inject a custom Elixir syntax in my projects.hauleth
Well, you can just do not use
use TaggedTupleand instead justrequire TaggedTuple.IvanR
I can imagine the situation that the
---operator is to be used somehow else in the project. Let’s see what can be done in regards to optional overriding.thojanssens1
Is it possible to see a snippet demonstrating where TaggedTuple can typically be useful?
BartOtten
I’m not sure about the use case over Records (besides nice helper functions for conversion). To me it seems ‘Tagged Tuple vs Record’ is like ‘Map vs Struct’. Dynamic vs static.
IvanR
Sure.
tagged_tupleis to operate with sum types. Which are one of the ways to making impossible states impossible in the app. Here is a good article about these https://thoughtbot.com/blog/better-domain-modeling-in-elixir-with-sum-typesHere is an example of
ShipmentWeightsum type that can be persisted with Ecto.And this is generic Domo/example_avialia/lib/example_avialia/tagged_tuple_ecto_type.ex at master · IvanRublev/Domo · GitHub to do so for any tagged tuple.
thojanssens1
Very interesting article! Thank you