Conventions used

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

Code in text: Indicates code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles. Here is an example: “In Ruby, we don’t really have a var_dump() function, but instead every object has a method already available called inspect().”

A block of code is set as follows:

require 'oj'
json_text = '{"name":"Sarah Kerrigan", "age":23, "human":true}'
ruby_hash = Oj.load(json_text)
puts ruby_hash
puts ruby_hash["name"]

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

gem uninstall oj

Bold: Indicates a new term, an important word, or words that you see onscreen. For instance, words in menus or dialog boxes appear in bold. Here is an example: “And when you click on the Sign up button, you should immediately see the page you were trying to browse to before being redirected.”

Tips or important notes

Appear like this.