Destructuring Structs in Rust | Rust Programming Tutorials

Introduction

In this lab, you will learn about destructuring structs in Rust, which allows you to extract individual fields and their values from a struct using pattern matching.

Note: If the lab does not specify a file name, you can use any file name you want. For example, you can use main.rs, compile and run it with rustc main.rs && ./main.

Skills Graph

%%%%{init: {'theme':'neutral'}}%%%% flowchart RL rust(("`Rust`")) -.-> rust/BasicConceptsGroup(["`Basic Concepts`"]) rust(("`Rust`")) -.-> rust/DataTypesGroup(["`Data Types`"]) rust(("`Rust`")) -.-> rust/FunctionsandClosuresGroup(["`Functions and Closures`"]) rust(("`Rust`")) -.-> rust/MemorySafetyandManagementGroup(["`Memory Safety and Management`"]) rust/BasicConceptsGroup -.-> rust/variable_declarations("`Variable Declarations`") rust/DataTypesGroup -.-> rust/integer_types("`Integer Types`") rust/DataTypesGroup -.-> rust/string_type("`String Type`") rust/FunctionsandClosuresGroup -.-> rust/function_syntax("`Function Syntax`") rust/FunctionsandClosuresGroup -.-> rust/expressions_statements("`Expressions and Statements`") rust/MemorySafetyandManagementGroup -.-> rust/lifetime_specifiers("`Lifetime Specifiers`") subgraph Lab Skills rust/variable_declarations -.-> lab-99314{{"`Destructuring Rust Structs with Pattern Matching`"}} rust/integer_types -.-> lab-99314{{"`Destructuring Rust Structs with Pattern Matching`"}} rust/string_type -.-> lab-99314{{"`Destructuring Rust Structs with Pattern Matching`"}} rust/function_syntax -.-> lab-99314{{"`Destructuring Rust Structs with Pattern Matching`"}} rust/expressions_statements -.-> lab-99314{{"`Destructuring Rust Structs with Pattern Matching`"}} rust/lifetime_specifiers -.-> lab-99314{{"`Destructuring Rust Structs with Pattern Matching`"}} end

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}");
}

Summary

Congratulations! You have completed the Structs lab. You can practice more labs in LabEx to improve your skills.

Destructuring Rust Structs with Pattern Matching

Introduction

Skills Graph

structs

Summary

Other Rust Tutorials you may like