constructor-iterable.js

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function testNullUndefined() {

  for (var i = 0; i < 100; i++) {

    var v = (i & 1) ? null : undefined;

    var map = new Map(v);

    assertEq(map.size, 0);

    var set = new Set(v);

    assertEq(set.size, 0);

testNullUndefined();

function testProtoGetter() {

  var count = 0;

  Object.defineProperty(Array.prototype, 1, { get: () => count++ });

  for (var i = 0; i < 100; i++) {

    var map = new Map([

      [1, 1],

      [2, 2],

      [3, /* hole */, 3],

]);

    assertEq(map.size, 3);

    assertEq(map.get(3), i * 3);

    var set = new Set(["a", /* hole */, "c"]);

    assertEq(set.size, 3);

    assertEq(set.has(i * 3 + 1), true);

    new Set([1, /* hole */,]); // Side-effects! Must not be optimized away.

  assertEq(count, 300);

testProtoGetter();

// The |iterable| argument can be a primitive value.

function testPrimitiveIterable() {

  Number.prototype[Symbol.iterator] = Array.prototype[Symbol.iterator];

  Number.prototype.length = 2;

  Number.prototype[0] = ["a", "b"];

  Number.prototype[1] = ["c", "d"];

  for (var i = 0; i < 100; i++) {

    var map = new Map(i);

    assertEq(map.size, 2);

    assertEq(map.get("c"), "d");

    var set = new Set(i);

    assertEq(set.size, 2);

    assertEq(set.has(Number.prototype[1]), true);

    var set2 = new Set("abc123abc");

    assertEq(set2.size, 6);

testPrimitiveIterable();