Conventions

In this book, you will find a number of styles of text 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: "In the checked mode, types are checked by calling assertions of the form assert (var1 is T), to control that var1 is of type T".

A block of code is set as follows:

main() {
  // running an external program process without interaction:
Process.run('notepad', ['tst.txt']).then((ProcessResultrs){
print(rs.exitCode);
print(rs.stdout);
print(rs.stderr);
  });
}

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

main() {
  // running an external program process without interaction:
Process.run('notepad', ['tst.txt']).then((ProcessResultrs){
print(rs.exitCode);
print(rs.stdout);
print(rs.stderr);
  });
}

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

# cp /usr/src/asterisk-addons/configs/cdr_mysql.conf.sample
 /etc/asterisk/cdr_mysql.conf

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: "First try this; right-click on your project and select Close Folder."

Note

Warnings or important notes appear in a box like this.

Tip

Tips and tricks appear like this.