Delete an element in an array javascript

delete_at.js

my_array = [
  1,
  2,
  4,
  5,
  6,
]
function delete_at(array, index) {
  tmp = array;
  tmp.splice(index, 1);
  return tmp;
}

console.log('before');
console.log(my_array);
console.log('after');
console.log(delete_at(my_array, 2));