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Edit summary for version 3 :

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Idiom #3 Create a procedure

Like a function which doesn't return any value, thus has only side effects (e.g. Print to standard output)

Idiom #3 Create a procedure

Like a function which doesn't return any value, thus has only side effects (e.g. Print to standard output)

Code
fn finish(name : &str) { println!("My job here is done. Goodbye {}", name); }
Comments bubble
The actual return type is Unit, typed '()' and can be ommited from function signature.