In this book, you will find a number of styles of text that distinguish among 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 calculateRabbits function calculates and returns an integer value; this is indicated by the word int preceding the function name."

A block of code is set as follows:

void main() {
  print("The number of rabbits increases as:\n");
  for (int years = 0; years <= NO_YEARS; years++) {
    rabbitCount = calculateRabbits(years);             
    print("After $years years:\t $rabbitCount animals");
}

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 main() {
  print("The number of rabbits increases as:\n");
  for (int years = 0; years <= NO_YEARS; years++) {
    rabbitCount = calculateRabbits(years);
    print("After $years years:\t $rabbitCount animals");
}

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

git clone git://github.com/dzenanr/collision_clones.git

New terms and important words are shown in bold. Words that you see on the screen, in menus or dialog boxes for example, appear in the text like this: "You can change this behavior by navigating to Tools | Preferences | Run and Debug, and change the Break on Exceptions to None."