Conventions 

In this book, you will find a number of text styles that distinguish between different kinds of information. Here are some examples of these styles and an explanation of their meaning.

Code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles are shown as follows: "The following function f has a side effect, though."

A block of code is set as follows:

user=> (def v [7 11 19 52 42 72]) 
#'user/v 
user=> (def v1 (conj v 52)) 
#'user/v1 

If there is a line (or lines) of code that needs to be highlighted, it is set as follows:

scala> def pop(queue: Fifo): (Int, Fifo) = { 
     |   queue.out match { 
     |     case Nil => throw new IllegalArgumentException("Empty queue"); 
 | case ...

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