rustHow to map struct in Rust

Mapping a struct in Rust is done using the .map() method. This method takes a closure as an argument and applies it to each element of the struct. The closure can be used to modify the elements of the struct, or to create a new struct with the modified elements.

Example

struct Point {
    x: i32,
    y: i32,
}

let points = vec![
    Point { x: 0, y: 0 },
    Point { x: 1, y: 5 },
    Point { x: 10, y: -3 },
];

let new_points = points.map(|p| Point { x: p.x, y: p.y + 1 });

println!("{:?}", new_points);

Output example

[Point { x: 0, y: 1 }, Point { x: 1, y: 6 }, Point { x: 10, y: -2 }]

Code explanation

• struct Point { x: i32, y: i32, }: This is the definition of the struct Point, which contains two fields, x and y, both of type i32.
• let points = vec![ Point { x: 0, y: 0 }, Point { x: 1, y: 5 }, Point { x: 10, y: -3 }, ];: This creates a vector of Point structs.
• let new_points = points.map(|p| Point { x: p.x, y: p.y + 1 });: This uses the .map() method to apply a closure to each element of the points vector. The closure creates a new Point struct with the same x value as the original, but with the y value incremented by 1.
• println!("{:?}", new_points);: This prints the modified vector of Point structs.

Helpful links

• Rust Documentation - Structs
• Rust Documentation - Vectors
• Rust Documentation - Closures

Edit this code on GitHub