Basic Algorithm Scripting - Slice and Splice

Exercises have become impossible to solve without any examples…
What am I supposed to do? I am getting frustrated.
What’s supposed to take 5 mins, is taking 60 mins only to fail and not even use splice and slice to make it!
Why would the lessons expect me to remember everything and understand everything perfectly up to that point is beyond me.

As the challenges become more complex, the key skill is not remembering the correct syntax, it is figuring out how to break down the question into smaller pieces.

They don’t. Nobody remembers everything perfectly.

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you’re supposed to be using references all the time. like this one:
https://devdocs.io/javascript/global_objects/array/slice