Get removed item's key from child_removed firebase event

Question

Is it possible to retrieve the key of the removed child's key in Firbase's on('child_removed') callback function?

Answer 1

From the Firebase documentation for on('child_removed':

This event will be triggered once every time a child is removed. The DataSnapshot passed into the callback will be the old data for the child that was removed.

firebaseRef.on('child_removed', function(oldChildSnapshot) {
  console.log('Child '+oldChildSnapshot.key()+' was removed');
});