Lesson 4 - Sets and set operations in Swift

In the previous lesson, Dictionaries in Swift, we introduced dictionaries. In today's Swift tutorial, we're getting to the last important collection, sets.

Sets

The set is characterized by the fact that each element exists only once in the set. The collection itself handles this condition and, after adding a new element, checks if there is the same element in it yet. If so, it's not going to add it again. This often saves us a lot of work because we don't have to manually check the unwanted duplicity of elements in the collection. A set could be a list of passengers on a bus since the same passenger can't be present more than once.

Before adding in a new element, the set will check whether it doesn't already contain it. In other words, it searches for it. The searching is implemented using hash calculations


 

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This tutorial talks about sets, how they work, and how are they implemented in the Swift language. We'll learn to perform various set operations.

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