downto(p1)
public
Iterates block, passing decreasing values from int down
to and including limit.
5.downto(1) { |n| print n, ".. " }
print " Liftoff!\n"
produces:
5.. 4.. 3.. 2.. 1.. Liftoff!
/*
* call-seq:
* int.downto(limit) {|i| block } => int
*
* Iterates <em>block</em>, passing decreasing values from <i>int</i>
* down to and including <i>limit</i>.
*
* 5.downto(1) { |n| print n, ".. " }
* print " Liftoff!\n"
*
* <em>produces:</em>
*
* 5.. 4.. 3.. 2.. 1.. Liftoff!
*/
static VALUE
int_downto(from, to)
VALUE from, to;
{
RETURN_ENUMERATOR(from, 1, &to);
if (FIXNUM_P(from) && FIXNUM_P(to)) {
long i, end;
end = FIX2LONG(to);
for (i=FIX2LONG(from); i >= end; i--) {
rb_yield(LONG2FIX(i));
}
}
else {
VALUE i = from, c;
while (!(c = rb_funcall(i, '<', 1, to))) {
rb_yield(i);
i = rb_funcall(i, '-', 1, INT2FIX(1));
}
if (NIL_P(c)) rb_cmperr(i, to);
}
return from;
}