ctietze, 1 month ago

@nicklockwood @natpanferova
just released https://books.nilcoalescing.com/swift-gems I've heard :)

matadan, 1 month ago

@nicklockwood have you got that you can use ‘case var’ as well as ‘case let’ in switch statements?

ctietze, 1 month ago (edited 1 month ago)

@nicklockwood where do you draw the line?

Knowing that for element in array works, but not for let element in array, but of course for var element in array does, is that advanced? :D

nicklockwood, 1 month ago

@ctietze this is a great tip - also other related for loop syntax quirks like for case let foo as type and where clauses

cocoafrog, 1 month ago

@ctietze @nicklockwood also loops can have where clauses, eg

for batch in batches where !batch.isEmpty { }

And let for optional unwrap works in loops as well:

var next: Node?
while let current = next {
// do stuff
next = current.parent
}

And you can combine the two.

helge, 1 month ago

@cocoafrog @ctietze @nicklockwood For this you can also use sequence, like for item in sequence(item) { $0.parent } { ... }.
But I also like the where, though I don't actually use it that often.

cocoafrog, 1 month ago

@helge @ctietze @nicklockwood oh yeah, sequence(next:) is one I learned recently and is great! It was more about the general concept of for let.

ctietze, 1 month ago

@cocoafrog @helge @nicklockwood What, where does that come from :O

I could've used that in tree walking recently. I'm giving back my "advanced Swift" badge.

icanzilb, 1 month ago

@ctietze @cocoafrog @helge @nicklockwood 🤦🏽‍♂️ feels like I got to re-review the standard lib one of these days