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A library to work with tagged tuples.
Tagged tuple is a tuple attaching a tag to a value {tag, value}.
Common tagged tuples are {:ok, value} and {:error, message} returned
from the functions.
A chain of tags can be attached to a single core value by nesting tagged tuples in each other.
For example, {:units, {:boxes, 1}} and {:units, {:kilograms, 2.5}}
tagged tuples describe the same deliverable item with different measures.
The tag chains of :units --- :boxes and :units --- :kilograms
can be efficiently pattern matched then to handle core values of
different types appropriately.
iex> use TaggedTuple
...> :tag --- 12
{:tag, 12}
...> tagged_tuple = :a --- :tag --- :chain --- 12
{:a, {:tag, {:chain, 12}}}
...> match?(:a --- :tag --- _tail, tagged_tuple)
true
...> :a --- t1 --- t2 --- core_value = tagged_tuple
...> t1 == :tag
...> t2 == :chain
...> core_value == 12- Inintial release
Copyright © 2021 Ivan Rublev
This project is licensed under the MIT license.