I am trying to destructure a tuple in a case statement and I am getting a warning that confuses me. It passes my test case, so it works, but the linter is giving me a warning and I’m not sure how to handle it. Am I doing a bad practice? I have a simplified scenario that demonstrates the warning belo…

[image] aegatlin: Interestingly, the linter shows the warning even with a guard clause of ... when is_tuple(x) and tuple_size(x) == 2. Correct. This will be fixed in v1.13.

I don’t know the source of the warning, but it would be more idiomatic to remember that case clauses are match expressions so you can destructure more simply: def test(x) do case x do {v1, v2} -> IO.puts(v1) IO.puts(v2) end end

What is this linter you are using? (Whatever it is, it just states, that not all tuples are 2-tuples.)

And if the only input you ever expect in your function is an arity-2 tuple, then you can also pattern-match in the function clause itself: def test({v1, v2}) do IO.puts(v1) IO.puts(v2) end

Interestingly, the linter shows the warning even with a guard clause of ... when is_tuple(x) and tuple_size(x) == 2. The linter is elixir-ls via the vscode wrapper for it. The method-level/case-level destructing does not produce the linter warning, which is why I marked the problem as solved (thank…