Am 2016-09-21 00:00, schrieb Ken Takata:
Hi Christian,

2016/9/21 Wed 5:31:26 UTC+9 Christian Brabandt wrote:
Hi,
I think I found a bug with lambda expressions.

I was looking into writing some automated tests and was trying to use
the new lambda expressions. However this does not work as expected:

Here is an example:
#v+
  let a = ['FOOBAR    "word"', 'FOOBAR    "word2"']
  let pat='^FOOBAR\s\+\zs"[^"]\+"'
  let pat2='^FOOBAR\s\+\("[^"]\+"\)'
  :echo map(copy(a), 'matchstr(v:val, g:pat)')
  -> result ['"word"', '"word2"']
  :echo map(copy(a), {val -> matchstr(val, g:pat)})
  -> BUG: result ['""', '""'], expected ['"word"', '"word2"']
:echo map(copy(a), 'substitute(v:val, g:pat2, ''\=submatch(1)'',"")')
  -> result ['"word"', '"word2"']
:echo map(copy(a), {val -> substitute(val, g:pat2, '\=submatch(1)', '')})
  -> BUG: result ['0', '1'], expected ['"word", '"word2"']
#v-

This is not a bug. map() always passes two arguments (key and val) to the
specified Funcref. So,

  :echo map(copy(a), {val -> matchstr(val, g:pat)})

this should be:

  :echo map(copy(a), {key, val -> matchstr(val, g:pat)})

Or you can still use v:val:

  :echo map(copy(a), {-> matchstr(v:val, g:pat)})

Hm, should there be an error when only one argument is given?
Or at least it should be more stressed in the documentatio, that two arguments
are expected.

Best,
Christian

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