use distinctUntilChanged on objects

Question

How can I have distinctUntilChanged work with objects like this

myObs = Observable.from([{foo: 'bar'}, {foo: 'bar'}]);

myObs.distinctUntilChanged()
  .subscribe(value => {
  // I only want to receive {foo: 'bar'} once
});

Answer 1

You need to pass a function inside the distinctUntilChanged that returns a boolean to make sure that the objects are the same.

Example

    myObs. distinctUntilChanged((a, b) => a.foo === b.foo)