The first few chapters of this book are, to the extant that I'm aware, the best introduction to the concepts of programming in existence. Also, the online vers

The first few chapters of this book are, to the extant that I'm aware, the best introduction to the concepts of programming in existence. Also, the online version of the book features an inline code-highlighting text editor from the same author as the book. You can use it to edit and evaluate the examples. It's actually the same editor used in the Chrome developer tools.