How do I create dictionary from array of tuples?

Question

Let’s say I have array of objects that can be identified and I want to create dictionary from it. I can easily get tuples from my array like so:

let tuples = myArray.map { return ($0.id, $0) } 

But I can’t see initializer for dictionary to take array of tuples. Am I missing something? Do I have create extension for dictionary for this functionality (in fact it’s not hard but I thought it would be supplied by default) or there is easier way to do that?



There is code for extension

extension Dictionary {     public init (_ arrayOfTuples : Array<(Key, Value)>)     {         self.init(minimumCapacity: arrayOfTuples.count)          for tuple in arrayOfTuples         {             self[tuple.0] = tuple.1         }     } } 

Answer 1

Swift 4

If your tuples is (Hashable, String) you can use:

let array = [("key1", "value1"), ("key2", "value2"), ("key3", "value3")] let dictionary = array.reduce(into: [:]) { $0[$1.0] = $1.1 } print(dictionary) // ["key1": "value1", "key2": "value2", "key3": "value3"]