Learning JavaScript Design Patterns is released under a Creative Commons Attribution-Noncommercial-No Derivative Works 3.0 unported license. It is available for purchase via O'Reilly Media but will remain available for both free online and as a physical (or eBook) purchase for readers wishing to support the project. This edition was updated to ES2015+ syntax in 2021. Design patterns are reusable solutions to commonly occurring problems in software design. They are both exciting...