gistfile1.txt

var lm = {
  buildDefaultAccumulator: function() {
     return new lm.Accumulator(0);
  },
  version: '0.1'
};

lm.Accumulator = function(initial) {
  this.value = initial;
  
  // Sequence is a private variable - it's inaccessible outside this function's scope
  var sequence = [initial];
  this.accumulate = function(additional) {
    this.value += additional;
    sequence.push(additional);
  };
  
  this.getSequence = function() {
     return sequence;
  };
}

lm.Printer = function(acc) {
  // acc is also like a private member variable.
  this.printAccumulator = function() {
     console.log(acc.value);
  }
  
  this.printSequence = function() {
    console.log(acc.getSequence());
  }
}

(function() {
  var acc = lm.buildDefaultAccumulator();
  acc.accumulate(5);
  acc.accumulate(2);
  var printer = new lm.Printer(acc);
  printer.printAccumulator();
  printer.printSequence();
})();