michael@0: // The Set constructor can take an argument that is an array.
michael@0: 
michael@0: var s = Set([]);
michael@0: assertEq(s.size, 0);
michael@0: assertEq(s.has(undefined), false);
michael@0: 
michael@0: s = Set(["one", "two", "three"]);
michael@0: assertEq(s.size, 3);
michael@0: assertEq(s.has("one"), true);
michael@0: assertEq(s.has("eleventeen"), false);
michael@0: 
michael@0: var a = [{}, {}, {}];
michael@0: s = Set(a);
michael@0: assertEq(s.size, 3);
michael@0: for (let obj of a)
michael@0:     assertEq(s.has(obj), true);
michael@0: assertEq(s.has({}), false);
michael@0: assertEq(s.has("three"), false);