structs
Similarly, a struct
can be destructured as shown:
fn main() { struct Foo { x: (u32, u32), y: u32, } // Try changing the values in the struct to see what happens let foo = Foo { x: (1, 2), y: 3 }; match foo { Foo { x: (1, b), y } => println!("First of x is 1, b = {}, y = {} ", b, y), // you can destructure structs and rename the variables, // the order is not important Foo { y: 2, x: i } => println!("y is 2, i = {:?}", i), // and you can also ignore some variables: Foo { y, .. } => println!("y = {}, we don't care about x", y), // this will give an error: pattern does not mention field `x` //Foo { y } => println!("y = {}", y), } let faa = Foo { x: (1, 2), y: 3 }; // You do not need a match block to destructure structs: let Foo { x : x0, y: y0 } = faa; println!("Outside: x0 = {x0:?}, y0 = {y0}"); // Destructuring works with nested structs as well: struct Bar { foo: Foo, } let bar = Bar { foo: faa }; let Bar { foo: Foo { x: nested_x, y: nested_y } } = bar; println!("Nested: nested_x = {nested_x:?}, nested_y = {nested_y:?}"); }