const obj = {
  value: 42,
  getValue() {
    return this.value;
  },
  getValueArrow: () => this.value,
  nested: {
    value: 100,
    getValue() {
      return this.value;
    }
  }
};

const extractedMethod = obj.getValue;
const boundMethod = obj.getValue.bind(obj);

console.log(obj.getValue() + ',' + obj.getValueArrow() + ',' + 
            obj.nested.getValue() + ',' + extractedMethod() + ',' + 
            boundMethod());