[Rd] paste(character(0), collapse="", recycle0=FALSE) should be ""
hp@ge@ @end|ng |rom |redhutch@org
Tue May 26 21:38:13 CEST 2020
On 5/26/20 06:24, Martin Maechler wrote:
> What about remaining back-compatible, not only to R 3.y.z with
> default recycle0=FALSE, but also to R 4.0.0 with recycle0=TRUE
What back-compatibility with R 4.0.0 are we talking about? The
'recycle0' arg was added **after** the R 4.0.0 release and has never
been part of an official release yet. This is the time to fix it.
> *and* add a new option for the Suharto-Bill-Hervé-Gabe behavior,
> e.g., recycle0="sep.only" or just recycle0="sep" ?
> As (for back-compatibility reasons) you have to specify
> 'recycle0 = ..' anyway, you would get what makes most sense to
> you by using such a third option.
> ? (WDYT ?)
Don't bother. I'd rather use
paste(paste(x, y, z, sep="#", recycle0=TRUE), collapse=",")
i.e. explicitly break down the 2 operations (sep and collapse). Might be
slightly less efficient but I find it way more readable than
paste(x, y, z, sep="#", collapse=",", recycle0="sep.only")
BTW I appreciate you trying to accomodate everybody's taste. That
doesn't sound like an easy task ;-)
I'll just reiterate my earlier comment that controlling the collapse
operation via an argument named 'recycle0' doesn't make sense (collapse
involves NO recycling). So I don't know if the current 'recyle0=TRUE'
behavior is "the correct one" but at the very least the name of the
argument is a misnomer and misleading.
More generally speaking using the same argument to control 2 distinct
operations is not good API design. A better design is to use 2
arguments. Then the 2 arguments can generally be made orthogonal (like
in this case) i.e. all possible combinations are valid (4 combinations
in this case).
> > Switching to scheme (3) or to a new custom scheme
> > would be a completely different proposal.
> >> At least I'm consistent right?
> > Yes :-)
> > Anyway discussing recycling schemes is interesting but not directly
> > related with what the OP brought up (behavior of the 'collapse' operation).
> > Cheers,
> > H.
> >> ~G
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