Slide 20
Slide 20 text
Timers inc
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let ref: FIRDatabaseReference = FIRDatabase.database().reference()
let ref_A: FIRDatabaseReference = ref.child("YOUR_REFERENCE_KEY_A”)
let ref_B: FIRDatabaseReference = ref.child(“YOUR_REFERENCE_KEY_B”)
ref_A.observeSingleEvent(of: .value, with: { (snapshot) in
ref_B.setValue(snapshot.value)
})