find the first node in a linked list in swift

To find the first node in a singly linked list in Swift, you simply access the head of the list. Here's an example implementation:

main.swift
class Node<T> {
    var value: T
    var next: Node<T>?
    
    init(_ value: T) {
        self.value = value
    }
}

class LinkedList<T> {
    var head: Node<T>?
    
    // other methods...
    
    func firstNode() -> Node<T>? {
        return head
    }
}
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In the LinkedList class, the head property represents the first node in the list. The firstNode() method simply returns this node. If the list is empty, head will be nil, and the method will return nil as well.