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: "In Scala, Unit is the same as the void, it does not represent any type."

A block of code is set as follows:

object First {
  def main(args: Array[String]): Unit = {
  val double: (Int => Int) = _ * 2
    (1 to 10) foreach double .andThen(println)
  }
}

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

package lsp

object FirstApp extends App {
  val double: (Int => Int) = _ * 2
  (1 to 10) foreach double .andThen(print)
}

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

sbt console

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: "Click on the Create New Project function."