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Code shared from the Rust Playground
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| fn main() { | |
| // If `option` is Some<T>, unwrap it and stick the value in `x`. | |
| if let Some(x) = option { | |
| foo(x); | |
| } | |
| } |
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| fn main() { | |
| let arg: Option<u8> = Some(42); | |
| //let arg: Option<u8> = None; | |
| let a: u8; | |
| // If the Option `arg` has Some() value, the value is bound to the | |
| // identifier in the pattern - in this case, `x`. In other words, if `arg` | |
| // has a value, `x` is bound to the result of unwrapping `arg`. | |
| // If `arg` is None, this branch isn't entered. | |
| if let Some(x) = arg { | |
| // If `arg` is None, this branch isn't entered. | |
| // `x` is the result of unwrapping `arg`. | |
| println!("x = {}", x); | |
| a = x; | |
| } else { | |
| // If `arg` is None, set a default value for `a`. | |
| a = 13; | |
| } | |
| println!("{}", a); | |
| } |
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