Harmeet Singh(Taara) harmeetsingh0013

## .Functional Programming in Scala Exercises
All exercises are attempted on https://coderpad.io

## introrx.md

      
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                harmeetsingh0013
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              August 29, 2015 14:24
                — forked from staltz/introrx.md
            
          
    The introduction to Reactive Programming you've been missing

(by @andrestaltz)
So you're curious in learning this new thing called Reactive Programming, particularly its variant comprising of Rx, Bacon.js, RAC, and others.
Learning it is hard, even harder by the lack of good material. When I started, I tried looking for tutorials. I found only a handful of practical guides, but they just scratched the surface and never tackled the challenge of building the whole architecture around it. Library documentations often don't help when you're trying to understand some function. I mean, honestly, look at this:

Rx.Observable.prototype.flatMapLatest(selector, [thisArg])


Projects each element of an observable sequence into a new sequence of observable sequences by incorporating the element's index and then transforms an observable sequence of observable sequences into an observable sequence producing values only from the most recent observable sequence.


## BaseDAO.scala
package core.dao

import scala.concurrent.Future

import play.api.Logger

import reactivemongo.core.commands.LastError
import reactivemongo.core.errors.DatabaseException

import core.db.MongoHelper
	package core.dao

	import scala.concurrent.Future

	import play.api.Logger

	import reactivemongo.core.commands.LastError
	import reactivemongo.core.errors.DatabaseException

	import core.db.MongoHelper