Question

How to zero a 2D array in Rust

Answer 1

fn main() {
    let mut array: [[i32; 3]; 2] = [
        [31, 24, 71],
        [ 4, 75, 96],
    ];
    
    println!("{:?}", array);

    for row in array.iter_mut() {
        for item in row.iter_mut() {
            *item = 0;
        }
    }

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

 
  
/*
run:
  
[[31, 24, 71], [4, 75, 96]]
[[0, 0, 0], [0, 0, 0]]
 
*/

 

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Answer 2

fn main() {
    let mut array: [[i32; 3]; 2] = [
        [31, 24, 71],
        [ 4, 75, 96],
    ];
    
    println!("{:?}", array);

    zero_array(&mut array);

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

fn zero_array(array: &mut [[i32; 3]; 2]) {
    for row in array.iter_mut() {
        for item in row.iter_mut() {
            *item = 0;
        }
    }
}


 
  
/*
run:
  
[[31, 24, 71], [4, 75, 96]]
[[0, 0, 0], [0, 0, 0]]
 
*/

 

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