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45 lines
1.1 KiB
Rust
45 lines
1.1 KiB
Rust
// ./src/flow_control/match/binding.md
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// A function `age` which returns a `u32`.
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fn age() -> u32 {
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15
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}
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fn part0() {
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println!("Tell me what type of person you are");
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match age() {
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0 => println!("I haven't celebrated my first birthday yet"),
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// Could `match` 1 ..= 12 directly but then what age
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// would the child be? Instead, bind to `n` for the
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// sequence of 1 ..= 12. Now the age can be reported.
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n @ 1 ..= 12 => println!("I'm a child of age {:?}", n),
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n @ 13 ..= 19 => println!("I'm a teen of age {:?}", n),
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// Nothing bound. Return the result.
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n => println!("I'm an old person of age {:?}", n),
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}
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}
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fn some_number() -> Option<u32> {
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Some(42)
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}
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fn part1() {
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match some_number() {
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// Got `Some` variant, match if its value, bound to `n`,
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// is equal to 42.
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Some(n @ 42) => println!("The Answer: {}!", n),
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// Match any other number.
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Some(n) => println!("Not interesting... {}", n),
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// Match anything else (`None` variant).
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_ => (),
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}
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}
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pub fn main() {
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part0();
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part1();
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}
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