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Enhancements on Linked lists #79

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Merged
TheSTL merged 2 commits into master from linked-lists
Oct 13, 2019
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56 changes: 31 additions & 25 deletions src/_DataStructures_/LinkedList/index.js
View file Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -8,32 +8,40 @@ class Node {
class LinkedList {
constructor() {
this.head = null;
this.tail = null;
this.size = 0;
}

addAtBeginning(element) {
this.head = new Node(element, this.head);
if (!this.tail) {
this.tail = this.head;
}
this.size += 1;
return this.head;
}

addAtEnd(element) {
const node = new Node(element, null);

if (!this.head) {
this.head = node;
} else {
let address = this.head;
while (address.next) {
address = address.next;
}
address.next = node;
return this.addAtBeginning(element);
}
const node = new Node(element, null);
this.tail.next = node;
this.tail = node;
this.size += 1;
return node;
}

removeFromBeginning() {
if (!this.head) {
return null;
}
if (this.head.next === null) {
this.tail = this.head;
}
const node = this.head;
this.head = this.head.next;
this.size -= 1;
return node;
}

Expand All @@ -47,8 +55,11 @@ class LinkedList {
address = address.next;
}

const node = address.next;
address.next = null;
this.tail = address;

const node = this.tail.next;
this.tail.next = null;
this.size -= 1;
return node;
}

Expand All @@ -63,11 +74,7 @@ class LinkedList {
if (!this.head) {
return null;
}
let address = this.head;
while (address.next) {
address = address.next;
}
return address;
return this.tail;
}

getAt(index) {
Expand Down Expand Up @@ -104,8 +111,10 @@ class LinkedList {
count -= 1;
}

previous.next = new Node(element, previous.next);
return null;
const node = new Node(element, previous.next);
previous.next = node;
this.size += 1;
return node;
}

removeAt(index) {
Expand All @@ -129,21 +138,18 @@ class LinkedList {

const node = address;
previous.next = address.next.next;
this.size -= 1;
return node;
}

length() {
let address = this.head;
let count = 0;
while (address) {
count += 1;
address = address.next;
}
return count;
return this.size;
}

delete() {
this.head = null;
this.tail = this.head;
this.size = 0;
}
}

Expand Down

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