Two Nifty Swift Loop Tricks

This week, I learnt two things about Swift that I’d never come across before. Both involve loops.

The first, via Erica Sadun: you can use case let in a for loop to conditionally bind optionals or cast items. Here’s the optional binding example from Erica’s post:

let items: [String?] = [nil, nil, "Hello", nil, "World"]
for case let item? in items {
    print(item)
}

Check out the full post, 3 simple for-in iteration tricks for some other neat tricks.

Secondly, from this post at KrakenDev: you can label loops in Swift! Here’s an example:

sectionLoop: for section in sections {
    rowLoop: for row in rows {
        if row.isMagical {
            break sectionLoop
        }
    }
}

Who knew?! There are a bunch more useful tips in the full post, Hipster Swift, including descriptions of what @noescape and @autoclosure actually do.