Re: Best practice and enhance performance duration of vimscript

> I have all book on gvim but no one tells me the best practice to have
> good performance when we write vimscript.

I'm not sure there's a bible of good performance, but in-built functions
that operate on larger swaths may be faster

> 2- Retrieving and writin data from the 1rst hash => 7 seconds
>
> the func is doing that :
>
> for l:key in keys(s:hash)
> let l:line = substitute
> (l:lineToChange,"TO_SUBSTITUTE_WITH_KEY",l:key,"g")
> let l:line = substitute(l:line,"TO_SUBSTITUTE_WITH_KEY2",s:hash
> [l:key].key2,"")
> let l:line = substitute(l:line,"TO_SUBSTITUTE_WITH_KEY3",s:hash
> [l:key].key3,"")
> exec 'norm o' . l:line
> endfor
>
> Can I reduce time ?

I'm not sure what exactly you're trying to achieve here -- mostly the
source of the l:lineToChange -- is this from some larger loop? The
reason it's confusing is that after you've gone through the loop once,
I'd expect that TO_SUB_WITH_KEY is no longer in the string, so
subsequent passes through the loop look like they're just appending the
same line (which, btw, I'd perform with

put=line

instead of via normal mode.)

My first thought would be to do fewer substitutes, which could be done
if your hashes are nested, so you have a double-dereferencing.
Something like

:%s/TSWK1\|TSWK2\|TSWK3/\=s:hash[submatch(0)]/g

or, if you have a bunch of keys, you might be able to do something like

:let @/=join(keys(s:hash), '\|')
:%s//\=s:hash[submatch[0]]/g

(you might have to escape the keys if there are funky regexp
metacharacter values in the hash keys)

-tim

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