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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--;
    }
  }
}