Hi Bram, On Fri, Aug 12, 2022 at 10:06 AM Bram Moolenaar <b...@moolenaar.net> wrote: > > > 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() ? >
Sounds good. Based on the suggestion from Maxim Kim, I will go with the name indexof(). - Yegappan -- -- 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/CAAW7x7mjjtEsbwq%3DAnUVHkawFoa8Vca8%3DP-Q1Dv4CyT_Z%3Dezag%40mail.gmail.com.
