> i want each lines of the output of a shell command to become a key of a
> dict. I wote this code:

> let t = {}
> for k in split( system("echo foo; echo bar "), '\n' )
>     let t[k] = 1
> endfor

> but i don't like it: as the loop is here to populate the dictionnary, i
> would like to use something more appropriate. In perl for exemple, the
> map function enables you to write

> my %a = map { $_ => 1 } split /\n/, qx< echo foo; echo bar>

> vim has the equivalent of $_: it's called v:val, so i tried to use map
> or filter with attempts looking like that:

> let t = map( split( system("echo foo; echo bar "), '\n' ), { v:val : 1 } )

> and yet i just wonder if it's possible.

> regards,
> marc

> On Mon, Nov 09, 2009 at 06:33:24PM +0100, Andy Wokula wrote:
>> It is possible, the second argument to map() must be a string:
>>     :h map()
>>     :let t = map(["foo", "bar"], '{v:val : 1}')

> i tried this solution but the result is

> [{'foo': 1}, {'bar': 1}]

> when i expect

> {'foo': 1, 'bar': 1 }

> regards

> marc

> " helper to keep the list unchanged (not required):
> func! KeepVal(_)
>     return v:val
> endfunc

> let in_list = ["foo", "bar"]
> let out_dict = {}
> call map(in_list, 'KeepVal(extend(out_dict, {v:val : 1}))')

>> " helper to keep the list unchanged (not required):
>> func! KeepVal(_)
>>     return v:val
>> endfunc

>> let in_list = ["foo", "bar"]
>> let out_dict = {}
>> call map(in_list, 'KeepVal(extend(out_dict, {v:val : 1}))')

> You don't need KeepVal():
> :call map(copy(in_list), 'extend(out_dict, {v:val : 1})')

> Christian Brabandt schrieb:
> > On Tue, November 10, 2009 12:19 pm, Andy Wokula wrote:
> >> let in_list = ["foo", "bar"]
> >> let out_dict = {}
> >> call map(in_list, 'KeepVal(extend(out_dict, {v:val : 1}))')

> > You don't need KeepVal():
> > :call map(copy(in_list), 'extend(out_dict, {v:val : 1})')

> I just didn't like getting a list full of dict references.  And the
> return value of map() will be less "junky".

> I personally don't think it is a good idea to use map for iterating
> over a list since it manipulates the list it is working on and returns
> that transformed list.

> Since vimscripts provides no high-order function to iterate over a
> list without modifying it, what's wrong with a dull looking for-loop:

> for k in list
>  let dict[k] = 1
> endfor

> Okay, that was the original solution anyway. I'd say stick to it.

> hello all

> many thanks for you tries and replies. all of them where very
> instructive.

> i'll stick on the for-loop solution as it seems that functionnal
> solutions are harder to read/debug in viml.

> regards
> marc

> let t=eval('{'.join(map(split(system("echo foo; echo bar"), "\n" ),
> '"''".v:val."'': 1"'), ',').'}')