[Rd] for in r-devel
ggrothendieck at gmail.com
Fri Mar 18 15:25:42 CET 2016
Regarding, this news item for r-devel:
‘for()’ loops are generalized to iterate over any object with ‘[[’ and
‘length()’ methods. Thanks to Hervé Pagès for the idea and the patch.
Below dd is an object for which [[ and length work but the result is
still numeric rather than Date class in "R Under development
(unstable) (2016-03-15 r70334)" as observed in the comments to:
Expanding on that:
dd <- Sys.Date() + 0:1
dd[] # [[ works
##  "2016-03-18"
length(dd) # length works
##  2
for(d in dd) str(d) # gives numeric rather than Date class
## num 16878
## num 16879
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