An interactive music theory cheat sheet with scales, diatonic chords, notes on the piano, notes on the staff and key signature for all major and minor keys.

This book is an invitation to discover advanced topics in category theory through concrete, real-world examples. It aims to give a tour: a gentle, quick introduction to guide later exploration. The tour takes place over seven sketches, each pairing an evocative application, such as databases, electric circuits, or dynamical systems, with the exploration of a categorical structure, such as adjoint functors, enriched categories, or toposes. No prior knowledge of category theory is assumed.

Why OO sucks

This is the first installment in the SOLID JavaScript series which will explore the SOLID design principles within the context of the JavaScript language.

In this first installment, we’ll take a look at what principles comprise the SOLID design principles and discuss the first of these principles: The Single Responsibility Principle.