Re: why use "let str = a:str" in a function

On Sep 22, 6:27 am, Ben Fritz <fritzophre...@gmail.com> wrote:
> On Sep 21, 10:00 pm, Bee <200...@calcentral.com> wrote:
> > The :help a:var does say "However, if a |List| or |Dictionary| is
> > used, you can change their contents."
>
> > I found this example function. Is {a:var} now a Dictionary?
>
> > function! Inc(var)
> >   let {a:var} += 1
> >   return {a:var}
> > endfunction
>
> > Is one better than the other?
>
> > function! Inc(var)
> >   let var = a:var
> >   let var += 1
> >   return var
> > endfunction
>
> As Ben H. says, these are NOT an example of using a:var as a
> dictionary. He gives an excellent explanation of what these two
> functions actually do, but here's an example of a function that uses a
> dictionary:
>
> function! Inc(var)
>   let a:var.value += 1
>   return a:var.value
> endfunction
>
> Call it like this:
>
> let my_dict = { 'value' : 1 }
> echo Inc(my_dict)
>
> This sort of thing allows for object-oriented constructs, as well as
> other uses.
>
> Basically it's saying that dictionaries and lists are always passed by
> reference. If you want to pass by value you'll need to copy them
> first:

Is it possible to increment all items in a dict without looping?

-Bill

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