On 2015-06-17 20:24, Joshua Bradley wrote:
How would this new '+' deal with factors, as paste does or as the current
'+'
does? Would number+string and string+number cause errors (as in current
'+' in R and python) or coerce both to strings (as in current R:paste and
in perl's '+').
I had posted this sample code previously to demonstrate how string
concatenation could be implemented
"+" = function(x,y) {
if(is.character(x) & is.character(y)) {
return(paste0(x , y))
} else {
.Primitive("+")(x,y)
}}
%+% might have been another option, possibly a more backward-compatible
one. "paste0 - %+%" pair also resembles "outer - %o%" and "match - %in%"
pairs.
My 2 cents.
PS: I don't agree that the subject is rather incomplete or just not true.
so it would only happen if both objects were characters, otherwise you
should expect the same behavior as before with all other classes. This
would be backwards compatible as well since string+string was never
supported before and therefore no one would have previously working code
that could break.
Josh Bradley
Goekcen.
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