How to avoid duplicate key error in swift when iterating over a dictionary

Question

I\'m practicing swift and I\'m trying to iterate over a Dictionary to print the key, but it gives me a

fatal error: Dictionary literal contains dupli

Answer 1

Create a People struct or class and use instances of that in an array rather than a dictionary:

struct Person {
    var age : Int
}

let people = [Person(age: 14), Person(age: 15)] // and so on

for person in people {
    print(person)
}    

A dictionary is a mapping of a unique key to some value. Therefore what you previously did was not working because your key age was not unique. You can however use a different dictionary:

let people = [14: Person(age: 14), 15: Person(age: 15)] // and so on

for (key, value) in people {
    print("\(key) => \(value)")
}