[swift-evolution] for-else syntax

[Nicolas Fezans]

I tend to write this kind of treatment the other way around...

if names.isEmpty {
// do whatever
} // on other cases I might have a few else-if to treat other cases that
need special treament
else {
for name in names {
// do your thing
}
}


Nicolas Fezans



On Wed, Feb 1, 2017 at 6:31 PM, Saagar Jha via swift-evolution <
swift-evolution at swift.org> wrote:

> If you’re fine with a couple extra characters, you can use .isEmpty:
>
> for name in names {
> // do your thing
> }
> if names.isEmpty {
> // do whatever
> }
>
> It’s a bit more typing, but I feel it makes your intentions more clear.
>
> Saagar Jha
>
> On Feb 1, 2017, at 8:48 AM, Chris Davis via swift-evolution <
> swift-evolution at 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
>
>
>
>
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