Question

How to resize a vector in Rust

Answer 1

fn main() {
    let mut numbers = vec![1, 2, 3];
    
    // Extend the vector to length 5, filling with 0
    numbers.resize(5, 0);
    println!("{:?}", numbers); // Output: [1, 2, 3, 0, 0]

    // Shrink the vector to length 2
    numbers.resize(2, 0);
    println!("{:?}", numbers); // Output: [1, 2]
}



/*
run:

[1, 2, 3, 0, 0]
[1, 2]

*/

 

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Answer 2

fn main() {
    let mut words = vec!["rust".to_string()];
    
    words.resize(3, String::from("default"));
    
    println!("{:?}", words); 
}



/*
run:

["rust", "default", "default"]

*/

 

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