Appendix G - Newest Features
This appendix documents features that have been added to stable Rust since the main part of the book was completed.
Field init shorthand
We can initialize a data structure (struct, enum, union) with named
fields, by writing fieldname
as a shorthand for fieldname: fieldname
.
This allows a compact syntax for initialization, with less duplication:
#[derive(Debug)] struct Person { name: String, age: u8, } fn main() { let name = String::from("Peter"); let age = 27; // Using full syntax: let peter = Person { name: name, age: age }; let name = String::from("Portia"); let age = 27; // Using field init shorthand: let portia = Person { name, age }; println!("{:?}", portia); }