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LibJS: Add the SetIterator built-in and Set.prototype.{values, entries}
While this implementation should be complete it is based on HashTable's iterator, which currently follows bucket-order instead of the required insertion order. This can be simply fixed by replacing the underlying HashTable member in Set with an enhanced one that maintains a linked list in insertion order.
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test("length", () => {
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expect(Set.prototype.values.length).toBe(0);
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});
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test("basic functionality", () => {
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const a = new Set([1, 2, 3]);
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const it = a.values();
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expect(it.next()).toEqual({ value: 1, done: false });
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expect(it.next()).toEqual({ value: 2, done: false });
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expect(it.next()).toEqual({ value: 3, done: false });
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expect(it.next()).toEqual({ value: undefined, done: true });
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expect(it.next()).toEqual({ value: undefined, done: true });
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expect(it.next()).toEqual({ value: undefined, done: true });
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});
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