Swift Daily

DAY #36

You can make your data structures iteratable. Here’s an example from https://holyswift.app/linked-lists-with-sequence-and-iteratorprotocol-in-swift . This is just one example of how swift’s expressiveness can help you make functional code.

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class LinkedList: Sequence {
    var root: LinkedListNode?

    func makeIterator() -> LinkedListIterator {
        return LinkedListIterator(start: root)
    }
}

class LinkedListIterator: IteratorProtocol { // Mark 1
    var current: LinkedListNode?

    init(start: LinkedListNode?) {
        current = start
    }

    func next() -> LinkedListNode? { // Mark 2
        let actual = current
        current = current?.next
        return actual
    }
}

let list = LinkedList()
let first = LinkedListNode(value: 1)
let second = LinkedListNode(value: 2)
let third = LinkedListNode(value: 3)

list.root = first
first.next = second
second.next = third

for node in list {
    dump(node.value)
}

Originally published 09/21/2021 @ https://pittcsc.org/ Discord

Published here on 09/09/2022. Blog published date reflects the original date of publication.