We made our first operator called multiplyBy, which looks a bit useful, but in practice we don't need it because it's too specific: it only does simple multiplication on numbers. In this lesson we will see how the map() operator is useful for any cal
You often need streams to trigger different behaviors on the data based on which streams triggers. This lessons shows how to use mapTo to pass functions into the scan operator and have completed control over you data. Current Code: const Observable =
