Command design pattern in JavaScript

Today's tech tip teaches you how to leverage the ‘𝗖𝗼𝗺𝗺𝗮𝗻𝗱 𝗱𝗲𝘀𝗶𝗴𝗻 𝗽𝗮𝘁𝘁𝗲𝗿𝗻 𝗶𝗻 𝗝𝗮𝘃𝗮𝗦𝗰𝗿𝗶𝗽t’ to make your code easily testable and easily maintainable.

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