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Fundamentals · easy

5. Functions and Expressions

Rust is an expression language.

1 min read2 questionsup to 50 XPtopic 5/50

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Functions annotate parameter and return types. A block's final expression, written without a semicolon, is its value. `if`, `match`, blocks and `loop` are all expressions that can produce values.

How to study this topic

  1. 1. Read the explanation once end to end, skipping the code.
  2. 2. Re-read the code snippets and say out loud what each line does.
  3. 3. Answer the quiz without scrolling back — that is the real check.
  4. 4. Read every explanation, even for the answers you got right.

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Check your understanding

  1. 1. A trailing expression without a semicolon…

  2. 2. Is `if` an expression?

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