diff --git a/some_example/Cargo.toml b/some_example/Cargo.toml new file mode 100644 index 0000000..301fbe6 --- /dev/null +++ b/some_example/Cargo.toml @@ -0,0 +1,9 @@ +[package] +name = "some_example" +version = "0.1.0" +authors = ["laurens "] +edition = "2018" + +# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html + +[dependencies] diff --git a/some_example/src/main.rs b/some_example/src/main.rs new file mode 100644 index 0000000..1b93b12 --- /dev/null +++ b/some_example/src/main.rs @@ -0,0 +1,21 @@ +fn plus_one(x: Option) -> Option { + match x { + None => None, + Some(i) => Some(i+1), + } +} + +fn main() { + let x = 5; + + println!("Val: {}, plus one: {}", x, plus_one(Some(x)).unwrap_or(1)); + + let x = Some(x); + + println!("Val: {}, plus one: {}", x.unwrap(), plus_one(x).expect("Bad val")); + + let x = None; + + println!("Val of none with default of 1: {}", x.unwrap_or(1)); + println!("Val of none with expect will panic: {}", x.expect("This will be panic because we have a None value")); +}