[BeetleB]

Random example: In my last job I would point out JS language features that would have made my coworker's code more concise and canonical.

I hadn't done any JS coding beyond a few examples from a tutorial.

There's no way I would have retained that knowledge otherwise.

There are many such examples. In general it's extremely useful for retaining things you are not going to develop muscle memory for.

"Memorizing by doing" is great if you're doing often. What if you're not?

[naet]

So you have cards for JavaScript features? What do they look like?

[BeetleB]

Basic stuff like syntax, macros of common functions etc.