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Copy pathlinkedList.js
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123 lines (97 loc) · 2.07 KB
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class Node {
constructor(value, next = null) {
this.value = value;
this.next = next;
}
}
class LinkedList {
constructor() {
this.head = null;
this.tail = null;
}
insert(value) {
const n = new Node(value);
if (this.head === null) {
this.head = n;
this.tail = n;
return this;
}
this.tail.next = n;
this.tail = n;
return this;
}
prepend(value) {
const n = new Node(value, this.head);
this.head = n;
if (this.tail === null) {
this.tail = n;
}
return this;
}
remove(value) {
if (this.head === null) return false;
let current = this.head;
if (current.value === value) {
if (this.head === this.tail) {
this.head = null;
this.tail = null;
} else {
this.head = this.head.next;
}
return true;
}
while (current.next !== null && current.next.value !== value) {
current = current.next;
}
if (current.next !== null) {
if (current.next === this.tail) {
this.tail = current;
}
current.next = current.next.next;
return true;
}
return false;
}
includes(value) {
if (this.head === null) return false;
let current = this.head;
while (current) {
if (current.value === value) return true;
current = current.next;
}
return false;
}
traverse(callback) {
let current = this.head;
while (current) {
callback(current);
current = current.next;
}
}
toString() {
let str = "";
this.traverse(node => {
str += node.value;
if (node.next !== null) str += ", ";
});
return str;
}
}
class LinkedListIterator {
constructor(list) {
this.list = list;
this.current = list.head;
}
next() {
if (this.current === null) {
return { done: true };
}
const value = this.current.value;
this.current = this.current.next;
return { value, done: false };
}
}
LinkedList.prototype[Symbol.iterator] = function() {
return new LinkedListIterator(this);
};
module.exports = LinkedList;