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2-linked-lists.js
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2-linked-lists.js
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function LinkedList() {
this.head = null;
this.tail = null;
}
function Node(value, next, prev) {
this.value = value;
this.next = next;
this.prev = prev;
}
LinkedList.prototype.addToHead = function(value) {
let newNode = new Node(value, this.head, null);
if (this.head) {
this.head.prev = newNode;
} else {
this.tail = newNode;
}
this.head = newNode;
}
LinkedList.prototype.addToTail = function(value) {
let newNode = new Node(value, null, this.tail);
if (this.tail) {
this.tail.next = newNode
} else {
this.head = newNode;
}
this.tail = newNode;
}
LinkedList.prototype.removeHead = function() {
if (!this.head) {
return null;
}
let val = this.head.value;
this.head = this.head.next;
if (this.head) {
this.head.prev = null
} else {
this.tail = null
}
return val;
}
LinkedList.prototype.removeTail = function() {
if (!this.tail) {
return null;
}
let val = this.tail.value;
this.tail = this.tail.prev;
if (this.tail) {
this.tail.next = null
} else {
this.head = null
}
return val;
}
LinkedList.prototype.search = function(searchValue) {
let currentNode = this.head;
while(currentNode) {
if (currentNode.value === searchValue) return currentNode.value
currentNode = currentNode.next;
}
return null;
}
LinkedList.prototype.indexOf = function(searchValue) {
let indexes = [];
let currentIndex = 0;
let currentNode = this.head;
while(currentNode) {
if (currentNode.value === searchValue) {
indexes.push(currentIndex)
}
currentNode = currentNode.next;
currentIndex++;
}
return indexes;
}
module.exports = {
LinkedList
};