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 cancel() method forces the test to be interrupted."

A block of code is set as follows:

test("one plus one with result") {
  val two = 2
  assertResult(two) { 1 + 1 }
}

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

 $ sbt test [info] Loading project definition from /helloworld/project [info] Set current project to Chap1 (in build file:/Packt/ helloworld /) [info] Compiling 1 Scala source to /Packt/ helloworld 
 /target/scala/classes...

New terms and important words are shown in bold. Words that you see on the screen, for example, in menus or dialog boxes, appear in the text like this: "Tail-call optimization is where we can escape allocating a new stack frame for a function."

Note

Warnings or important notes appear in a box like this.

Tip

Tips and tricks appear like this.