>
> "Are there suggestions on the table for something like a group of
> functions that can be optionally
placed at the beginning of a function that do all the verifications needed
> and that can also provide
some other things. What if the first line of your function looked like"
^ Yes, this is what the {rlang} standalone checks do. See the source:
https://github.com/r-lib/rlang/blob/main/R/standalone-types-check.R
I wrote about how I use them in the package {arcgisgeocode}
https://josiahparry.com/posts/2024-06-30-type-safety/
This is a staple in every package I develop. It stops a lot of errors from
occurring but it's definitely not as easy as `arg: integer()`.
Example usage:
https://github.com/R-ArcGIS/arcgisgeocode/blob/3a7877641ca2f3a761ef0ec3a7486820ab94c9cc/R/core-find-candidates.R#L104-L141
"Of course R does have comments"
^ Comments aren't visible to users of packages. Having type checking on
inputs is a huge QOL improvement that can reduce the number of
accidental bugs. {S7} helps get there but I find myself using the same
rlang checks even in S7.
On Thu, Nov 27, 2025 at 9:09 AM Gabor Grothendieck <[email protected]>
wrote:
> Of course R does have comments:
>
> f <- function( a, # character
> b, # data.frame
> c # logical
> ) {
> ...
> }
>
> On Wed, Sep 17, 2025 at 1:26 PM IVO I WELCH <[email protected]> wrote:
> >
> >
> > Suggestion for Syntax Sugar:
> >
> > Would it make sense to permit a simple way to allow a coder to document
> the function argument type?
> >
> > f <- function( a:chr, b:data.frame, c:logi ) { … }
> >
> > presumably, what comes behind the ‘:’ should match what ‘str’ returns.
> >
> > however, this need not be checked (except perhaps when a particular
> option is set). catching errors as soon as possible makes code easier to
> debug and error messages clearer.
> >
> > regards,
> >
> > /iaw
> >
> > ______________________________________________
> > [email protected] mailing list
> > https://stat.ethz.ch/mailman/listinfo/r-devel
>
>
>
> --
> Statistics & Software Consulting
> GKX Group, GKX Associates Inc.
> tel: 1-877-GKX-GROUP
> email: ggrothendieck at gmail.com
>
> ______________________________________________
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