Within the Node class, the next property can only be assigned a value of type Node or null.
class Node {
value: any;
next: Node | null;
prev: Node | null;
constructor(value: any) {
this.value = value;
this.next = null;
this.prev = null;
}
}
However, it seems that in the push function, specifically in the line "this.tail!.next = newNode;", we are assigning just the reference of the newNode to the next property. This means that newNode is merely a reference and does not contain values for next or prev like in the Node class.
push(value: any) {
const newNode = new Node(value);
if (this.length === 0) {
this.head = newNode;
this.tail = newNode;
} else {
this.tail!.next = newNode;
newNode.prev = this.tail;
this.tail = newNode;
}
this.length++;
return this;
}
This raises the question of how a reference alone can suffice as the value of next, instead of an instance of Node with defined properties.