find the last node in a linked list in swift

To find the last node in a linked list in Swift, we need to traverse the linked list until we reach the last node. The last node is the node that has a next pointer that points to nil. Here's some sample code:

main.swift
func findLastNode(head: Node?) -> Node? {
    var currentNode = head
    while currentNode?.next != nil {
        currentNode = currentNode?.next
    }
    return currentNode
}
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In this code, head is the first node in the linked list. We start by setting currentNode to the head node. Then, we iterate through the linked list by following the next pointers until we reach the last node. When we reach the last node, the next pointer will be nil, so we exit the loop and return currentNode.

Note that we return an optional Node type, since the linked list might be empty (in which case head will be nil) and we won't be able to find the last node.