[Rd] Declaring Types at Function Declaration

[Hadley Wickham]

You might be interested in Jim Hester’s old experiment that used ? -
https://github.com/jimhester/types

Hadley

On Wednesday, September 17, 2025, IVO I WELCH <iwelch using g.ucla.edu> 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
>
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