Amazon Q2. Front-End Engineer

// write a function that compare 2 js objects and return the diff?
// Example:
// assume that values are objects or strings
var obj1 = {
  prop1: 'prop1',
  prop2: 'prop2',
  prop4: {
    a:'a',
    b:'b'
  }
};

var obj2 = {
  prop2: 'prop2 modified',
  prop3: 'new prop foo',
  prop4:{
    b:'v',
    c:'c'
  }
};
diff(obj1, obj2);

// should return the following
// {
//   added: ["prop3", “prop4.c”],
//   deleted: ["prop1", “prop4.a”],
//   modified: ["prop2", “prop4.b”]
// }