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LinkedList ES6 Implementation
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| class LinkedList { | |
| constructor() { | |
| this.head = null; | |
| this.tail = null; | |
| this.count = 0; | |
| } | |
| get length() { | |
| return this.count; | |
| } | |
| addLast(data) { | |
| // Create a new Node | |
| const node = { | |
| data: data, | |
| next: null | |
| } | |
| if(this.count === 0) { | |
| // If this is the first Node, assign it to head | |
| this.head = node; | |
| } else { | |
| // If not the first node, link it to the last node | |
| this.tail.next = node; | |
| } | |
| this.tail = node; | |
| this.count++; | |
| } | |
| addFirst(data) { | |
| // Create a new Node | |
| const node = { | |
| data: data, | |
| next: null | |
| } | |
| // Save the first Node | |
| const temp = this.head; | |
| // Point head to the new Node | |
| this.head = node; | |
| // Add the rest of node behind the new first Node | |
| this.head.next = temp; | |
| this.count++; | |
| if(this.count === 1) { | |
| // If first node, | |
| // point tail to it as well | |
| this.tail = this.head; | |
| } | |
| } | |
| removeFirst(data) { | |
| if(this.count > 0) { | |
| // The head should point to the second element | |
| this.head = this.head.next; | |
| this.count--; | |
| if(this.count === 0) { | |
| // If list empty, set tail to null | |
| this.tail = null; | |
| } | |
| } | |
| } | |
| removeLast(data) { | |
| if(this.count > 0) { | |
| if(this.count === 1) { | |
| this.head = null; | |
| this.tail = null; | |
| } else { | |
| // Find the Node right before the last Node | |
| let current = this.head; | |
| while(current.next !== this.tail) { | |
| current = current.next; | |
| } | |
| current.next = null; | |
| this.tail = current; | |
| } | |
| this.count--; | |
| } | |
| } | |
| } |
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dataarguments ofremoveLastandremoveFirstlook unneeded.