Rust Programming Language/

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Solution Review: Resizing a Vector

Solution Review: Resizing a Vector

This lesson will give a detailed review of the solution to the challenge in the previous lesson.

We'll cover the following...

Solution

Rust 1.40.0
fn test(my_vec: &mut Vec<u32>)-> &mut Vec<u32>{
   let middle = (my_vec.len())/2;
   my_vec.pop(); 
   my_vec.remove(middle - 1);
   let mut sum : u32 = 0;
   for v in my_vec.iter()
   {
      sum = sum + v;
   }
   my_vec.push(sum);
   my_vec
}
fn main(){
    let mut v1 = vec![1, 5, 7, 9];
    println!("Original Vector: {:?}", v1);
    println!("Updated Vector: {:?}", test(&mut v1));
    let mut v2 = vec![1, 2, 3, 1, 2, 6];
    println!("Original Vector: {:?}", v2);
    println!("Updated Vector: {:?}", test(&mut v2));
}

Explanation

A function test is declared with my_vec of type u32 passed to it as a parameter.

  • On line 3, a number is removed from the last index using pop ...