Ernie Rael wrote:
> On 8/12/22 7:41 AM, Yegappan Lakshmanan wrote:
> > Hi all,
> >
> > The index() function returns the lowest index in a List where an item
> > has a value equal to the supplied expression. This function cannot be
> > used to find an item with a specific key/value pair in a List of Dicts
> > (or to use a custom search in a List). You need to resort to using a
> > for loop to find the index.
> >
> > What do you think about extending the index() function to accept a
> > lambda function (similar to map(), filter() and reduce())? This lambda
> > function will be called with two arguments: the index of the item and the
> > value of the item. If this function returns true, then the search will
> > stop.
> >
> > Currently the index() function accepts four arguments (the first two
> > arguments are mandatory and the last two arguments are optional). To
> > support using a lambda function, a fifth optional argument 'eval' needs
> > to be added. If this is true, then the second 'expr' argument will be
> > evaluated. It would have been simpler to add new arguments if the third
> > argument is a Dict.
>
> How about if the 3rd argument is a dict, then there are only/exactly
> three arguments
> and the dict specifies optional parameters? The old definition is
> unchanged with 2+2.
Instead making the index() arguments quite complicated, it's probably
better to add a new function that takes two arguments: the list and a
dict with various (optional) arguments. Or, to make it more like map()
and filter(), the second argument would be the lambda/funcref and the
third argument a dict with optional arguments. That's probably best,
since the only optional argument that makes sense is the start index.
Not sure what to call it, indexfunc() ?
--
ARTHUR: Who are you?
TALL KNIGHT: We are the Knights Who Say "Ni"!
BEDEVERE: No! Not the Knights Who Say "Ni"!
"Monty Python and the Holy Grail" PYTHON (MONTY) PICTURES LTD
/// Bram Moolenaar -- b...@moolenaar.net -- http://www.Moolenaar.net \\\
/// \\\
\\\ sponsor Vim, vote for features -- http://www.Vim.org/sponsor/ ///
\\\ help me help AIDS victims -- http://ICCF-Holland.org ///
--
--
You received this message from the "vim_dev" maillist.
Do not top-post! Type your reply below the text you are replying to.
For more information, visit http://www.vim.org/maillist.php
---
You received this message because you are subscribed to the Google Groups
"vim_dev" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to vim_dev+unsubscr...@googlegroups.com.
To view this discussion on the web visit
https://groups.google.com/d/msgid/vim_dev/20220812170549.128A11C0823%40moolenaar.net.
