Pattern Matching a Function Body: Lists

June 22, 2019
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6 Comments

  1. romenigld on December 14, 2020 at 10:58 am

    I like the exercises.
    I just notice the exact number for run the tests.
    They aren’t running in the beginning of each tests.
    Exercise #1: mix test test/lists_test.exs:22
    Exercise #2: mix test test/lists_test.exs:32
    and the so on….

    • Mark Ericksen on March 13, 2021 at 6:43 pm

      Right! You just pick a line that’s inside the test. I like to pick something around the middle so if I add or delete lines, the correct test is still run.

  2. Uzo Enudi on March 13, 2021 at 11:24 am

    Solution:
    def sum_pair([first, second]), do: first + second

    My solution:
    def sum_pair([first, second | []]), do: first + second

    Some overthinking went in there 🙂

    • Mark Ericksen on March 13, 2021 at 6:43 pm

      But hey! It works! 🙂

  3. Maksym Kosenko on December 8, 2021 at 12:25 pm

    For exercise 1 this only one function covers all tests:

    def is_empty?(something), do: something == []

    I don’t know if it fits the philosophy of Elixir

    • Mark Ericksen on December 8, 2021 at 12:38 pm

      Ha! Yes, that works. This is more about practicing applying pattern matching in function headers. In case it wasn’t already known, you could use Enum.empty?(something) instead of writing a custom function at all! So, it’s really just about practice. 🙂

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