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Speaker notes for 6.5 Functions

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Adds speaker notes covering functions basics (declaration parameters, return values, the 'unit' type.
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Robin Stringer 2023-01-19 12:16:43 +00:00 committed by GitHub
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src/basic-syntax/functions.md
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@ -29,3 +29,12 @@ fn fizzbuzz_to(n: u32) { // `-> ()` is normally omitted
}
}
```
<details>
* We refer in `main` to a function written below. Neither forward declarations nor headers are necessary.
* Declaration parameters are followed by a type (the reverse of some programming languages), then a return type.
* The last expression in a function body becomes the return value. Simply omit the `;` at the end of the expression.
* Some functions have no return value, and output the 'unit type', `()`. The compiler will infer this if the `-> ()` return type is omitted.
</details>