End of Life Ruby 3.0 has reached end of life and gets no more fixes. Switch to Ruby 4.0 →
instance method
Integer#downto
int.downto(limit) {|i| block } → self
int.downto(limit) → an_enumerator
numeric.c
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static VALUE
int_downto(VALUE from, VALUE to)
{
RETURN_SIZED_ENUMERATOR(from, 1, &to, int_downto_size);
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;
}
Iterates the given block, passing in decreasing values from int down to and including limit.
If no block is given, an Enumerator is returned instead.
Example
5.downto(1) { |n| print n, ".. " } puts "Liftoff!" #=> "5.. 4.. 3.. 2.. 1.. Liftoff!"