add a node to the end of a linked list in swift

main.swift
class Node<T> {
    var value: T
    var next: Node<T>?
    
    init(value: T) {
        self.value = value
    }
}
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main.swift
func append<T>(node: Node<T>, toLinkedList linkedList: Node<T>?) -> Node<T> {
    if linkedList == nil {
        return node
    }
    
    var current = linkedList
    while current?.next != nil {
        current = current?.next
    }
    
    current?.next = node
    return linkedList!
}
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main.swift
let node1 = Node(value: 1)
let node2 = Node(value: 2)

let list = append(node: node1, toLinkedList: nil)
let newList = append(node: node2, toLinkedList: list)

// The linked list now contains nodes with values 1 and 2.
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