JAVASCRIPT

compare two objects deep

JSON.stringify(obj1) === JSON.stringify(obj2)

compare objects

//No generic function to do that at all.
//use Lodash, famous for such must have functions, all efficiently built
//http://lodash.com/docs#isEqual --- 

npm install lodash

_.isEqual(object, other);

js compare objects

const isEqual = (...objects) =>
  objects.every((obj) => JSON.stringify(obj) === JSON.stringify(objects[0]));
if (!isEqual(this.lastValue, val)) {