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FRP – the concat() and sorted() functions Marble diagram

So far, we did simple Marble diagrams, which apply only one function at a time. However, we can compose functions one by one in a sequential order to solve some complex problems easily and in an elegant way.

Now, we will draw Marble diagram for the concat() and sorted() functions. Let's consider some Scala code using these two functions:

scala> val hello = "Hello" 
hello: String = Hello 
 
scala> val world = "World" 
world: String = World 
 
scala> hello.concat(world) 
res17: String = HelloWorld 
 
scala> hello.concat(world).sorted 
res19: String = Hwdellloor

We can represent them as a Marble diagram, as follows:

In the same way, we can represent any Functional or Reactive or FRP function as a Marble diagram to understand it well.