michael@0: // set.delete(v) decrements set.size iff the set contained v.
michael@0: 
michael@0: var s = Set();
michael@0: for (var i = 0; i < 10; i++)
michael@0:     s.add(i);
michael@0: 
michael@0: for (var i = 10; i > 0; i--) {
michael@0:     assertEq(s.size, i);
michael@0:     assertEq(s.delete(i), false);
michael@0:     assertEq(s.size, i);
michael@0:     assertEq(s.delete(i - 1), true);
michael@0:     assertEq(s.size, i - 1);
michael@0:     assertEq(s.delete(i - 1), false);
michael@0:     assertEq(s.size, i - 1);
michael@0: }