michael@0: // Clearing a Map removes its entries; the Map remains usable afterwards.
michael@0: 
michael@0: var m = Map([["a", "b"], ["b", "c"]]);
michael@0: assertEq(m.size, 2);
michael@0: m.clear();
michael@0: assertEq(m.size, 0);
michael@0: assertEq(m.has("a"), false);
michael@0: assertEq(m.get("a"), undefined);
michael@0: assertEq(m.delete("a"), false);
michael@0: assertEq(m.has("b"), false);
michael@0: for (var pair of m)
michael@0:     throw "FAIL";  // shouldn't be any pairs
michael@0: 
michael@0: m.set("c", "d");
michael@0: assertEq(m.size, 1);
michael@0: assertEq(m.has("a"), false);
michael@0: assertEq(m.has("b"), false);