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2172e51246
This implements the missing step 6a of 14.7.5.6 ForIn/OfHeadEvaluation:
a. If exprValue is undefined or null, then
i. Return Completion { [[Type]]: break, [[Value]]: empty, [[Target]]: empty }.
In other words, this should just do nothing instead of throwing during
the undefined to object coercion:
for (const x in undefined);
51 lines
1.1 KiB
JavaScript
51 lines
1.1 KiB
JavaScript
test("iterate through empty string", () => {
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const a = [];
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for (const property in "") {
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a.push(property);
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}
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expect(a).toEqual([]);
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});
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test("iterate through number", () => {
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const a = [];
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for (const property in 123) {
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a.push(property);
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}
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expect(a).toEqual([]);
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});
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test("iterate through empty object", () => {
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const a = [];
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for (const property in {}) {
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a.push(property);
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}
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expect(a).toEqual([]);
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});
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test("iterate through string", () => {
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const a = [];
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for (const property in "hello") {
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a.push(property);
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}
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expect(a).toEqual(["0", "1", "2", "3", "4"]);
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});
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test("iterate through object", () => {
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const a = [];
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for (const property in { a: 1, b: 2, c: 2 }) {
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a.push(property);
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}
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expect(a).toEqual(["a", "b", "c"]);
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});
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test("iterate through undefined", () => {
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for (const property in undefined) {
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expect.fail();
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}
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});
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test("use already-declared variable", () => {
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var property;
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for (property in "abc");
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expect(property).toBe("2");
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});
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