Set-constructor-2.js

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// The Set constructor can take an argument that is an array.

var s = new Set([]);

assertEq(s.size, 0);

assertEq(s.has(undefined), false);

s = new Set(["one", "two", "three"]);

assertEq(s.size, 3);

assertEq(s.has("one"), true);

assertEq(s.has("eleventeen"), false);

var a = [{}, {}, {}];

s = new Set(a);

assertEq(s.size, 3);

for (let obj of a)

    assertEq(s.has(obj), true);

assertEq(s.has({}), false);

assertEq(s.has("three"), false);