remove a node from the beginning of a linked list in swift

To remove the first node of a linked list in Swift, you need to update the head property of the linked list to point to the second node. The first node can be deallocated by removing all references to it. Here is an example of how to remove the first node of a linked list in Swift:

main.swift
class Node<T> {
    var value: T
    var next: Node?

    init(value: T) {
        self.value = value
    }
}

class LinkedList<T> {
    var head: Node<T>?

    func removeFirst() {
        head = head?.next
    }
}
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In the removeFirst() method, we update the head to point to the second node in the linked list by setting it to head?.next. If the linked list is empty, head will be nil. The first node is automatically deallocated by removing all references to it.

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