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Explain why functions returns extra information with tuples #12824

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Jul 28, 2023
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Explain why functions returns extra information with tuples #12824

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Explain why functions returns extra information with tuples
Florent2 Jul 28, 2023
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Update lib/elixir/pages/getting-started/lists-and-tuples.md
josevalim Jul 28, 2023
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2 changes: 1 addition & 1 deletion lib/elixir/pages/getting-started/lists-and-tuples.md
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Expand Up @@ -150,7 +150,7 @@
{:error, :enoent}
```

If the path given to `File.read/1` exists, it returns a tuple with the atom `:ok` as the first element and the file contents as the second. Otherwise, it returns a tuple with `:error` and the error description.
If the path given to `File.read/1` exists, it returns a tuple with the atom `:ok` as the first element and the file contents as the second. Otherwise, it returns a tuple with `:error` and the error description. `File.read/1` returns a tuple, not a list, because it always contains two values. As we will soon learn, Elixir allows us to _pattern match_ on such shapes. Returning a list would not bring any advantages.

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Emphasis style should be consistent 

lib/elixir/pages/getting-started/lists-and-tuples.md:153:337 MD049/emphasis-style Emphasis style should be consistent [Expected: asterisk; Actual: underscore] https://github.com/DavidAnson/markdownlint/blob/v0.29.0/doc/md049.md

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Emphasis style should be consistent 

lib/elixir/pages/getting-started/lists-and-tuples.md:153:351 MD049/emphasis-style Emphasis style should be consistent [Expected: asterisk; Actual: underscore] https://github.com/DavidAnson/markdownlint/blob/v0.29.0/doc/md049.md

Most of the time, Elixir is going to guide you to do the right thing. For example, there is an `elem/2` function to access a tuple item but there is no built-in equivalent for lists:

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