In the last chapter, we learned how we can use an operator to transform the data emitted by an observable, and also how we can chain this operator, making it reusable as each operator creates a new observable which can be used by multiple observers.
We learned how we can use the following four different operators:
These operators are the most important and most used in functional reactive programming. We saw examples and diagrams to make sure we understood how we can use these operators.
The usage of these operators goes beyond the last chapter. We will keep using them through the whole book, and we will use them heavily in the last two chapters, ...