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LibJS: Implement Set.prototype.symmetricDifference
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test("basic functionality", () => {
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expect(Set.prototype.symmetricDifference).toHaveLength(1);
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const set1 = new Set(["a", "b", "c"]);
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const set2 = new Set(["b", "c", "d", "e"]);
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const symmetricDifference1to2 = set1.symmetricDifference(set2);
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const symmetricDifference2to1 = set2.symmetricDifference(set1);
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for (const symmetricDifferenceSet of [symmetricDifference1to2, symmetricDifference2to1]) {
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expect(symmetricDifferenceSet).toHaveSize(3);
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["a", "d", "e"].forEach(value => expect(symmetricDifferenceSet.has(value)).toBeTrue());
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}
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});
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