Identify all 23 Gang of Four patterns from ES5 or ES6 code, then review definitions and examples. Source: https://github.com/zoltantothcom/Design-Patterns-JavaScript (Unlicense).

Every public app is built from a security-scanned skill and must pass a clean scan — skill and frontend — before it can be listed. Have a skill of your own? Turn it into an app — or read the step-by-step walkthrough.