[R] as.character(quote(x$y) ) = "$" "x" "y" not "x$y"?

[Duncan Murdoch]

On 10/05/2014, 6:46 AM, Barry Rowlingson wrote:
> On Fri, May 9, 2014 at 10:42 PM, Hadley Wickham <h.wickham at gmail.com> wrote:
>> Beware of the is.* functions:
>>
>> * is.object() does not test the usual definition of objects
>> * is.vector() does not test the usual definition of vectors
>> * is.numeric() does not work the same way as is.character() or is.integer()
>> * is.Date() doesn't exist
>> * is.nan() doesn't return TRUE for some NaNs
>
>   Can we have an "is.is" function that tells us these things?
>
>   > is.is(is.object)
>     [1] FALSE
>      Warning: is.object() does not test the usual definition of objects
>
>   > is.is(is.is)
>     [1] TRUE
>
>   For further exploration, demo("is.things") creates a handy "is.ALL"
> function that outputs the result of running a lot of is.X functions on
> its argument.

I tried to write it, but the trouble is, is.is(is.is) is FALSE.

Duncan