Sharing a Cold Observable
Learn how more than one subscriber is dealt with and the usage of the bufferWithTime operator.
We'll cover the following...
Let’s get back to the example of earthquakes. The code we have so far looks reasonable. We have a quakes Observable with two subscriptions: one that paints the earthquakes on the map, and another that lists them in the table.
However, we can make our code much more efficient. By having two subscribers to quakes, we are, in fact, requesting the data twice. We can check that by putting a console.log inside the flatMap operator in quakes.
This happens because quakes is a cold Observable, and it will re-emit all its values to each new subscriber. Therefore, a new ...