Vectors

• Is a similar collection type to the Array, provided by the standard library, that is allowed to grow or shrink in size.

Creation

let mut v = Vec::new();

v.push(5);
v.push(6);
v.push(7);
v.push(8);

let v = vec![1, 2, 3];

Access

• Without handling Out of Bounds:

  let v = vec![1, 2, 3, 4, 5];
  
  let third: &i32 = &v[2];
  println!("The third element is {third}");
  

• Handling Out of Bounds:

  let third: Option<&i32> = v.get(2);
  match third {
      Some(third) => println!("The third element is {third}"),
      None => println!("There is no third element."),
  }
  

• Getting all elements:

  let v = vec![100, 32, 57];
  for i in &v {
      println!("{i}");
  }
  

• Mutating with the *  dereference operator.

  let mut v = vec![100, 32, 57];
  for i in &mut v {
      *i += 50;
  }