switch case statements in game code example

Example: switch gml

switch (keyboard_key)
{
  case vk_left:
  case ord("A"):
  x -= 4;
  break;
  case vk_right:
  case ord("D"):
  x += 4;
  break;
  case vk_up:
  case ord("W"):
  y -= 4;
  break;
  case vk_down:
  case ord("S"):
  y += 4;
  break;
}