Question

How to decrease value in dictionary with Swift

Answer 1

var dic : [String: Int] = ["Swift": 4, "Python": 7, "Java": 6, "PHP": 5]
  
dic["Swift"]? -= 3

for (key, value) in dic {
    print(key, value)
}

  
  
/*
run:
  
Swift 1
Java 6
PHP 5
Python 7

*/

 

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