CountedSet

Minimal implementation of a counted Set in Swift.

We start by creating a CountedSet instance using a Hashable element type and by adding and removing objects:

let words = CountedSet<String>()
words.insert("Hello")
words.insert("World")
words.insert("Hello")
words.remove("World")

We can ask the CountedSet for the count of an element, which is also possible using subscripting:

let helloCount = words.count(for: "Hello") // 2
let worldCount = words.count(for: "World") // nil
let anotherHelloCount = words["Hello"] // 2

Access the most occurring element and its count, which will be returned as an optional tuple containing the element and its count:

if let (element, count) = words.mostFrequent() {
    // Do something with element and count
}

It is also possible to set a specific count for an element directly (to avoid having to insert it multiple times for example). This operation returns a Bool specifying whether or not the count changed:

let changed = words.setCount(42, for: "Result")

daehn/Counted-Set

CountedSet