The single worst publishing decision that has ever been made. Nothing redeeming about this volume, it merely lists directory listings and generic information more akin to someone who has heard about ruby than someone who knows how to do anything with it. Full of spelling and grammatical errors and factual inaccuracies – this book will both cause people to fail to learn ruby (through no fault of their own) and contribute to landfill overuse in any country it is published through being completely and utterly useless. Any ill luck received by the author is well deserved – they should be ashamed of themselves.