Conventions used

There are a number of text conventions used throughout this book.

CodeInText: Indicates code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles. Here is an example: " The map() function does not give us the expected results, so we only use flatMap() function."

A block of code is set as follows:

    object HelloWorldApp extends App{ 
      println("Hello Scala World!") 
    }

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

  For comprehension addition output: Some(Success(30))
  Scala Future API addition output: Some(Success(30))
  Scala Async API addition output: Some(Success(30))

Bold: Indicates a new term, an important word, or words that you see onscreen. For example, words in menus or dialog boxes appear in the text like this. Here is an example: "Go to  Configure at the bottom right and click on the Plugins option available in the drop-down."