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

On Tue, 21 Sep 2010, Bee wrote:

> why use "let str = a:str" in a function
>
> Looking at some functions, I have seen "let str = a:str"
>
> Why not just use a:str everywhere?
> Other than typing convenience.

I'm presuming it's mainly typing convenience, but one reason that comes
to mind is having a copy of the original value.

fun! Frobnicate(str)
let str = a:str
" lots of things that modify 'str'
if str =~? "some horrible error"
throw "Couldn't Frobnicate your string".
\ string({'input': a:str,'partially frobnicated':str})
"...

Another might be 'mental' convenience... For a long time when I was
learning Vimscript, I never remembered to type the 'a:'. 'let'ing to a
function-local var of the same name would mitigate that problem.

--
Best,
Ben

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