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: "An anonymous enum declaration does not declare a new type."

A block of code is set as follows:

void healthBasedSwap(int[] squad1, int[] squad2) {
  import std.algorithm : sort, SwapStrategy;
  import std.range : chain;
  squad1.chain(squad2).sort!((a,b) => a > b,
  SwapStrategy.unstable)();
} 

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

void healthBasedSwap(int[] squad1, int[] squad2) {
  import std.algorithm : sort, SwapStrategy;
  import std.range : chain;
  squad1.chain(squad2).sort!((a,b) => a > b,
  SwapStrategy.unstable)();
} 

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

dmd hello.d