SE-0284 introduced the ability to have functions, subscripts, and initializers use multiple variadic parameters as long as all parameters that follow a variadic parameter have labels. Before Swift 5.4, you could only have one variadic parameter in this situation.
So, with this improvement in place we could write a function that accepts a variadic parameter storing the times goals were scored during a football match, plus a second variadic parameter scoring the names of players who scored:
import Foundation
func summarizeGoals(times: Int..., players: String...) {
let joinedNames = ListFormatter.localizedString(byJoining: players)
let joinedTimes = ListFormatter.localizedString(byJoining: times.map(String.init))
print("\(times.count) goals where scored by \(joinedNames) at the follow minutes: \(joinedTimes)")
}To call that function, provide both sets of values as variadic parameters, making sure that all parameters after the first variadic are labeled:
summarizeGoals(times: 18, 33, 55, 90, players: "Dani", "Jamie", "Roy")
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Other changes in Swift 5.4…
- Improved implicit member syntax
- Local functions now support overloading
- Creating variables that call a function of the same name
- Result builders
- Property wrappers are now supported for local variables
- Packages can now declare executable targets
Download all Swift 5.4 changes as a playground Link to Swift 5.4 changes
