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dot_dot
2005 Feb 24
3
string concatenation operator
Why doesn't R have one, like "." in Perl or juxtaposition in awk?
It does not seem impossible to introduce one, if that would be
reasonable. It would seem to involve adding a table entry to
main/names.c for the binary operator and a corresponding internal
function, say do_dot(). This cannot be simply do_paste(), since
the implied separator is "". So, do_dot() might be similar, but
if it finds a non-string operand, a syntax error would be issued,
in place of the message from do_paste() noting a bad *argument*.
Precedence must be decided, but it may not matter...