ios - Value of variable not changing in observeSingleEvent -


the variable num changes want inside observesingleevent, after changes empty value. how value of num change?? 

   var num = int()    firdatabase.database().reference().child("menus/day1").observesingleevent(of: .value, with: {(snap) in      print(snap)      if let snapdict = snap.value as? [string:anyobject]{          self.num = snapdict["date"] as! int         print(num)         //returns number want      }     })      print(num)     //returns empty value      if num == 5 {         print("number 5")     else {         print("number not 5")         //goes      }

any work need values coming firebase must done within completion handler (the with part of method call). use/manipulate num value firebase, need use within completion handler. 

var num = int()  firdatabase.database().reference().child("menus/day1").observesingleevent(of: .value, with: {(snap) in      print(snap)      if let snapdict = snap.value as? [string:anyobject]{          self.num = snapdict["date"] as! int          if self.num == 5 {             print("number 5")         else {             print("number not 5")         }     } })

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