suspendCoroutine example with firebase

suspendCoroutine.kt

override suspend fun getBooleanValue(key: String, default: Boolean): Boolean = suspendCoroutine { continuation ->
    fireBaseDb.child("keys").child(key).addListenerForSingleValueEvent(object : ValueEventListener {
        override fun onCancelled(p0: DatabaseError?) {
            continuation.resume(default)
        }

        override fun onDataChange(p0: DataSnapshot?) {
            if (p0 != null) {
                continuation.resume(p0.getValue(Boolean::class.java) ?: default)
            } else {
                continuation.resume(default)
            }
        }
    })
}