Swipe up and Swipe down functionality?

You can try the following code:

Bangle.on("swipe", function(dirLeftRight, dirUpDown) {
  if (dirLeftRight == -1) {
    // left
    console.log("left");
  } else if (dirLeftRight == 1) {
    // right
    console.log("right");
  } else if (dirUpDown == -1) {
    // up
    console.log("Up");
  } else if (dirUpDown == 1) {
    // down
    console.log("Down");
  }
});