SE-0326 dramatically improves Swift’s ability to use parameter and type inference for closures, meaning that many places where we had to specify explicit input and output types can now be removed.
Previously Swift really struggled for any closures that weren’t trivial, but from Swift 5.7 onwards we can now write code like this:
let scores = [100, 80, 85]
let results = scores.map { score in
if score >= 85 {
return "\(score)%: Pass"
} else {
return "\(score)%: Fail"
}
}
Prior to Swift 5.7, we needed to specify the return type explicitly, like this:
let oldResults = scores.map { score -> String in
if score >= 85 {
return "\(score)%: Pass"
} else {
return "\(score)%: Fail"
}
}
SPONSORED Join a FREE crash course for mid/senior iOS devs who want to achieve an expert level of technical and practical skills – it’s the fast track to being a complete senior developer! Hurry up because it'll be available only until October 1st.
Sponsor Hacking with Swift and reach the world's largest Swift community!
Download all Swift 5.7 changes as a playground Link to Swift 5.7 changes
Link copied to your pasteboard.