Welcome to our tutorial focusing on Linked List Operations using TypeScript. Singly-Linked Lists (or just Linked Lists) are one of the most fundamental data structures used in computer science. They provide an efficient way to store and access data that is not necessarily contiguous in memory. This distinctive feature sets linked lists apart from arrays, making them an essential tool in a programmer's toolkit.

To work with linked lists, we first need to define a ListNode class, which represents a node within the linked list, utilizing TypeScript's type annotations for clarity and type safety.

class ListNode {
    value: number;
    next: ListNode | null;

    constructor(value: number = 0, next: ListNode | null = null) {
        this.value = value;  // Holds the value or data of the node
        this.next = next;  // Points to the next node in the linked list; default is null
    }
}

// Initialization of a linked list
let head: ListNode = new ListNode(1, new ListNode(2, new ListNode(3, new ListNode(4, new ListNode(5)))));

In the ListNode class:

• value holds the data of the node.
• next is a reference to the next node in the linked list. It defaults to null, indicating that the node does not link to any other node when freshly created.

Understand that a linked list is a linear data structure where each element is a separate object called a node. A node comprises data and a reference (link) to the next node in the sequence.

The provided code creates a linked list where each node points to another as follows: 1 -> 2 -> 3 -> 4 -> 5, and the last node points to null.