michael@0: // Clearing a Map after deleting some entries works.
michael@0: 
michael@0: var m = Map([["a", 1], ["b", 2], ["c", 3], ["d", 4]]);
michael@0: for (var [k, v] of m)
michael@0:     if (k !== "c")
michael@0:         m.delete(k);
michael@0: m.clear();
michael@0: assertEq(m.size, 0);
michael@0: assertEq(m.has("c"), false);
michael@0: assertEq(m.has("d"), false);