Add two arrays of numbers

pub fn add_arrays(a: &[i32], b: &[i32]) -> Vec<i32> {
  let mut result = Vec::new();
  for i in 0..a.len() {
    result.push(a[i] + b[i]);
  }
  result
}

assert_eq!(add_arrays(&[1, 2], &[3, 4]), [4, 6]);