Data transformation

A data transformation is an operation (or operator), which is applied on a set of source data elements or all data elements in a data stream and produces resultant data elements to send to another data stream:

As we use this data transformation to represent a functional operation, Reactive operation, or both, we also call this as an FP operator or RP operator, or FRP operator. It is also known as a Reactive Stream operator, Functional Reactive operator, or Data Flow operator.

Some of the FP operators are map, flatMap, reduce, fold, and filter. They are also known as combinators in the Scala World. Refer to Chapter 2, Functional Scala, to understand what a Scala combinator is.

We will pick up some of the important and useful FRP operators and discuss them with Marble diagrams in subsequent sections.