var a = 'hi';
var obj = {a};
console.log(obj); //Object {a: "hi"}

var a = 'hi';
var obj = {
  name: 'ES6',
  a,
  sayHi(){
    console.log(this.a+' '+this.name);
  }
}
obj.sayHi(); //hi ES6

var a = 'b';
var obj = {
  [a]: 'ES6',
  ['c' + 'd']: 'hi'
}
console.log(obj); // Object {b: "ES6", cd: "hi"}

var a = 'hi';
var obj = {
  name: 'ES6',
  a,
  sayHi(){
    console.log(this.a+' '+this.name);
  }
}
obj.sayHi(); //hi ES6
console.log(obj.sayHi.name); //sayHi

var obj_source_1 = {
  a: {
    a1: 'hi',
    a2: 'ES6'
  },
  b: 'hello'
}
var obj_source_2 = {
  c: 'ES2015',
}
var result = Object.assign({}, obj_source_1, obj_source_2);
console.log(result); //Object {a: Object, b: "hello", c: "ES2015"}