C++ std::remove.
I would never have guessed what it does exactly. (It moves elements that match the filter to the front, and moves the end-marker forward. Leaves all the elements in the collection. You need to erase them yourself. )
bsnpApproved := tvShows reject: [ :eachShow | eachShow hasNaughtyContent ].
(It also has remove-if-not but that's deprecated and if you use it your code smells.)
> I always struggle to remember if ‘filter’ keeps elements that match the condition or removes them
`filter(where:)` like in swift...?
And it's a doubly-good analogy, because I have occasionally gotten that confused in real-life as well. Twice in the past ten years I've had a stock boil away for three hours, and then set a colander in the sink and poured it through, only to watch my beautiful stock swirl down the drain because motor-memory made me forget that I wasn't draining pasta but should have put the colander in a bowl...
In Common Lisp both functions exist, under the names `remove-if` and `remove-if-not`.