JavaScript is a popular language known for its flexibility. It's thanks to this that makes patterns like the command pattern easier to implement in...
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probably need an unsubscribe for good memory management
These design pattern posts are very very valuable. Especially given that most design pattern guides you will see on the web will be written as a class instead of a function.
Definitely on the look out for more design patterns written in a functional programming approach from you.
For me command pattern is same as event driven.