Many proposals were made to enhance the Dictionaries and make them more powerful. In certain scenarios, Dictionaries might behave in an unexpected manner, and for this reason, many suggestions were made to change the way Dictionaries currently work in certain situations.
Let’s take a look at an example. Filtering returns the same data type; in Swift 3, if you used a filter operation on a Dictionary, the return type of the result would be a tuple (with key/value labels) and not a Dictionary. Consider this example:
let people = ["Tom": 24, "Alex": 23, "Rex": 21, "Ravi": 43]let middleAgePeople = people.filter { $0.value > 40 }
After the execution, you cannot use middleAgePeople["Ravi"] since the returned result ...
