michael@0: // map.delete(k) decrements the map size iff an entry was actually removed.
michael@0: 
michael@0: var m = Map();
michael@0: m.delete(3);
michael@0: assertEq(m.size, 0);
michael@0: m.set({}, 'ok');
michael@0: m.set(Math, 'ok');
michael@0: assertEq(m.size, 2);
michael@0: m.delete({});
michael@0: assertEq(m.size, 2);
michael@0: m.delete(Math);
michael@0: assertEq(m.size, 1);
michael@0: m.delete(Math);
michael@0: assertEq(m.size, 1);