I ran into this not too long ago. Something to handle this case would definitely be nice, but I agree we shouldn’t take python’s syntax with different semantics.
> On Feb 1, 2017, at 9:30 AM, Dimitri Racordon via swift-evolution > <swift-evolution@swift.org> wrote: > > I agree. A for-else loop with different semantics than python would be > error-prone for many people. > > >> On 1 Feb 2017, at 18:17, Jacob Bandes-Storch via swift-evolution >> <swift-evolution@swift.org <mailto:swift-evolution@swift.org>> wrote: >> >> One possible con: this is subtly but extremely different from Python, where >> a for loop's else clause is executed only if there was no `break` from the >> loop. >> On Wed, Feb 1, 2017 at 8:48 AM Chris Davis via swift-evolution >> <swift-evolution@swift.org <mailto:swift-evolution@swift.org>> wrote: >> Hi, >> >> Often when I’m programming I stumble upon this scenario: >> >> I have a list of items that may or may not be empty - if it’s full, I do one >> thing, if it’s empty I do something else, my code looks like this: >> >> class Example_1 >> { >> let names = ["Chris", "John", "Jordan"] >> >> /// Loop over names, if no names, print no names >> func run() >> { >> for name in names >> { >> print(name) >> } >> >> if names.count == 0 >> { >> print("no names") >> } >> } >> } >> >> let exampleOne = Example_1() >> exampleOne.run() >> >> However, Personally, I would find it more pleasing to write something like >> this: >> >> class Example_2_Proposed >> { >> let names:[String] = [] >> >> /// Loop over names, if no names, print no names >> func run() >> { >> for name in names >> { >> print(name) >> } else { >> print("no names") >> } >> } >> } >> >> let exampleTwo = Example_2_Proposed() >> exampleTwo.run() >> >> The difference here is a “for-else” type syntax where if there were no items >> in the array it would simply fall through to the else statement. >> >> What would be the pros/cons of introducing such syntax? >> >> Is there’s a way of doing something similar in swift already? >> >> Thanks >> >> Chris >> >> >> >> >> _______________________________________________ >> swift-evolution mailing list >> swift-evolution@swift.org <mailto:swift-evolution@swift.org> >> https://lists.swift.org/mailman/listinfo/swift-evolution >> <https://lists.swift.org/mailman/listinfo/swift-evolution> >> _______________________________________________ >> swift-evolution mailing list >> swift-evolution@swift.org <mailto:swift-evolution@swift.org> >> https://lists.swift.org/mailman/listinfo/swift-evolution > > _______________________________________________ > swift-evolution mailing list > swift-evolution@swift.org > https://lists.swift.org/mailman/listinfo/swift-evolution
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