Conventions used

There are a number of text conventions used throughout this book.

CodeInText: Indicates code words in text, React component names, test names, directory names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles. Here is an example: "In test/domManipulators.js, add the following new property to the return object of createContainer."

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

$ mkdir css
$ cd css

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: "The final test for the Undo button is to check that it dispatches an UNDO action when it is clicked."