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[ENXF NET]

Code:

var Queue = function() {
  this.first = null;
  this.size = 0;
};

var Node = function(data) {
   this.data  = data;
  this.next = null;
};

Queue.prototype.enqueue = function(data) {
  var node = new Node(data);

if (!this.first){
    this.first = node;
  } else {
    n = this.first;
    while (n.next) {
      n = n.next;
    }
    n.next = node;
  }

this.size += 1;
  return node;
};

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