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, and user input are shown as follows: "If the computation fails, the Future object will contain the cause for the failure (throwable)."

A block of code is set as follows:

    import scala.concurrent.Future 
    import scala.concurrent.ExecutionContext.Implicits.global 
 
    val future: Future[Double] = Future{math.sqrt(100000)}     

When we wish to draw your attention to a particular part of a code block, the relevant lines or items are set in bold:

    implicit val currentThreadExecutionContext =   
      ExecutionContext.fromExecutor(new Executor { 
        def execute(runnable: Runnable) { 
          runnable.run() 
        } 
      }) 

Any command-line input or output is written as follows:

cd first-app
sbt

New terms and important words are shown in bold.