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var obj = {
  value:1,
  
  increment:function () {
    this.value += 1;
    return this;
  },
  
  add:function (v) {
    this.value += v;
    return this;
  },
  
  shout:function () {
    console.log(this.value);
  }
};

// chain method calls
obj.increment().add(3).shout(); // 5

// as opposed to calling them one by one
// obj.increment();
// obj.add(3);
// obj.shout();