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singly-linked-list.js
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singly-linked-list.js
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class Node {
constructor(value, next) {
this.value = value;
this.next = next;
}
}
class SinglyLinkedList {
#head;
#tail;
constructor() {
this.#head = null;
this.#tail = null;
}
prepend(newValue) {
const newNode = new Node(newValue, this.#head);
this.#head = newNode;
this.#tail = this.#tail || newNode;
}
append(newValue) {
const newNode = new Node(newValue, null);
if (!this.#head) {
this.#head = this.#tail = newNode;
} else {
this.#tail.next = newNode;
this.#tail = newNode;
}
}
find(item) {
let current = this.#head;
while (current) {
if (current.value === item) {
return current;
}
current = current.next;
}
return -1;
}
findPrevious(item) {
let current = this.#head;
while (current) {
if (current.next.value === item) {
return current;
}
current = current.next;
}
return -1;
}
insert(newValue, item) {
let element = this.find(item);
if (!~element) {
this.append(newValue);
return;
}
const newNode = new Node(newValue, element.next);
element.next = newNode;
}
display() {
let current = this.#head;
while (current) {
console.log("display: ", current.value);
current = current.next;
}
}
remove(item) {
let element = this.find(item);
let previousElement = this.findPrevious(item);
if (!~element) return;
if (!~previousElement) {
this.#head = this.#head.next;
return;
}
previousElement.next = element.next;
}
}
const list = new SinglyLinkedList();
list.prepend("A");
list.prepend("Z");
list.prepend("Y");
list.prepend("X");
list.prepend("U");
list.append("B");
list.append("K");
list.append("L");
list.append("O");
list.append("P");
list.insert("C", "A");
list.insert("D", "C");
list.remove("C");
list.display();