[swift-evolution] Proposal: optionally define nested functions elsewhere

[Amir Michail]

> On Feb 7, 2016, at 10:04 AM, Craig Cruden <ccruden at novafore.com> wrote:
> 
> If indentation is a big problem …. either you have a very small monitor, or you may have too much conditional code :p
> 
> If your functions are concise and you don’t create big spaghetti conditional code - I would not think indentation would be a great problem.

Nested functions allow you to reduce the length of parameter lists. And so you may end up with a very long function containing many nested functions while trying to reduce parameter list size.

> 
> Usually I create functions inside functions for duplicate code within that function — and even without that de-duplication a function should not be too large, so once you reduplicate the code should be …. pretty short.
> 
> 
>> On 2016-02-07, at 21:59:43, Amir Michail <amichail at gmail.com> wrote:
>> 
>> 
>>> On Feb 7, 2016, at 9:57 AM, Craig Cruden <ccruden at novafore.com> wrote:
>>> 
>>> Is there a language that implements it this way?  
>>> 
>>> I actually don’t much like it, most of my functions are fairly small and I actually like it the way it is.
>>> 
>>> If you are using an IDE or editor it is easy to collapse the function if it is not what you want to focus on.  
>>> 
>> 
>> Another problem with nested functions is that the indentation keeps increasing thus leaving less room for the code. This proposal also avoids that problem.
>> 
>>> 
>>>> On 2016-02-07, at 21:32:19, Amir Michail via swift-evolution <swift-evolution at swift.org> wrote:
>>>> 
>>>> The problem with nested functions is that they can make the function containing them very long and hard to read.
>>>> 
>>>> So the idea is to separate the body of a nested function from where it is declared.
>>>> 
>>>> For example:
>>>> 
>>>> func f() {
>>>> var x:Int
>>>> func g(y:String) {
>>>> print(“x=\(x), y=\(y)")
>>>> }  
>>>> ...
>>>> }
>>>> 
>>>> could be refactored as:
>>>> 
>>>> func f() {
>>>> var x:Int
>>>> func g(y:String) // function body elsewhere to avoid clutter in f
>>>> ...
>>>> }
>>>> 
>>>> func f().g(y:String) {
>>>> print(“x=\(x), y=\(y)")
>>>> }  
>>>> 
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>>> 
>> 
>