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Elixir / Values and Matching

Underscore ignored values

Learn Underscore ignored values in Elixir through a focused explanation, a dedicated topic-specific example, an engineering boundary, and a mastery check.

10 min read • Beginner

Underscore ignored values is a focused Elixir lesson inside Values and Matching. The example uses the construct named in the lesson directly rather than reusing a generic placeholder.

Trace the example from its inputs through Underscore ignored values and identify the behavior that would change if that construct were removed or replaced. Pay attention to the language-specific rules shown by the syntax, because neighboring lessons intentionally exercise different mechanisms.

Topic-specific example

elixir-0010-c6ac80ddf2.exs
elixir Try It Live 
values = [11, 12, 13]
IO.inspect(Enum.sum(values)) # Underscore ignored values
Edge case / engineering note

For Underscore ignored values, test one realistic boundary: empty data, invalid input, unavailable resources, lifetime/cleanup, type constraints, or concurrency timing where applicable. A successful happy path is not enough to prove the construct is used correctly.

Content source & attribution
Original Syntaxis Content · Original Syntaxis Content

Lesson quizzes

Underscore ignored values Mastery Check →
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