Swift Language Extensions Restrictions
Example
It is possible to write a method on a generic type that is more restrictive using where sentence.
extension Array where Element: StringLiteralConvertible {
func toUpperCase() -> [String] {
var result = [String]()
for value in self {
result.append(String(value).uppercaseString)
}
return result
}
}
Example of use
let array = ["a","b","c"]
let resultado = array.toUpperCase()
