FRP – the merge() function Marble diagram

Suppose we have a code like this to merge two data streams of the same type:

scala> val list1 = List(1,24) 
list1: List[Int] = List(1, 24) 
 
scala> val list1 = List(1,2,4) 
list1: List[Int] = List(1, 2, 4) 
 
scala> val list2 = List(3,5) 
list2: List[Int] = List(3, 5) 
 
scala> list1 ++ list2 
res0: List[Int] = List(1, 2, 4, 3, 5) 

Alternatively, we have a user-defined function, merge(), as shown here:

scala> def merge[A](list1:List[A], list2:List[A]): List[A] = list1 ++ list2 
merge: [A](list1: List[A], list2: List[A])List[A] 
scala> merge(list1,list2) 
res1: List[Int] = List(1, 2, 4, 3, 5) 

If we want to represent this merge() function's Marble diagram, we can do so as follows:

Here, Input Data Stream1 is list1 and Input Data Stream2 is list2. When we make a call to the merge() function with them, we will get the resulting (or output) data stream.