[swift-evolution] for-else syntax

[Saagar Jha]

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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