objek javascript gabungan dangkal

var obj1 = {
  foo: {
    prop1: 42,
  },
};

var obj2 = {
  foo: {
    prop2: 21,
  },
  bar: {
    prop3: 10,
  },
};

var result = {
  foo: {          // `foo` got overwritten with the value of `obj2`
    prop2: 21,
  },
  bar: {
    prop3: 10,
  },
}
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