linked_list.js

function LinkedList(){
	let head = null;
  let node = function(ele){
  	this.ele = ele;
    this.next = null;
  }
  
  this.insertFirst = function(ele){
    let n = new node(ele);
    if(head === null){
    	head = n;
    }else{
    let cur = head;
    	while(cur.next){
      	cur = cur.next;
      }
      cur.next = n;
    }   
  }
  this.print = function(){
  	while(cur.next){
    	console.log(cur.ele);
    }
  }
}

let l = new LinkedList();
l.insertFirst(1);
l.print();