How to do the chain sequence in rxjs

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The equivalent of then for observables would be flatMap. You can see some examples of use here :

For your example, you could do something like :

this._myService.doSomething()
  .flatMap(function(x){return functionReturningObservableOrPromise(x)})
  .flatMap(...ad infinitum)
  .subscribe(...final processing)

Pay attention to the types of what your functions return, as to chain observables with flatMap you will need to return a promise or an observable.

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