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Libraries: Move to Userland/Libraries/
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1857 changed files with 266 additions and 274 deletions
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@ -1,100 +0,0 @@
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describe("correct behavior", () => {
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test("iterate through array", () => {
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const a = [];
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for (const num of [1, 2, 3]) {
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a.push(num);
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}
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expect(a).toEqual([1, 2, 3]);
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});
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test("iterate through string", () => {
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const a = [];
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for (const char of "hello") {
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a.push(char);
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}
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expect(a).toEqual(["h", "e", "l", "l", "o"]);
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});
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test("iterate through string object", () => {
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const a = [];
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for (const char of new String("hello")) {
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a.push(char);
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}
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expect(a).toEqual(["h", "e", "l", "l", "o"]);
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});
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test("use already-declared variable", () => {
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var char;
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for (char of "abc");
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expect(char).toBe("c");
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});
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test("respects custom Symbol.iterator method", () => {
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const o = {
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[Symbol.iterator]() {
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return {
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i: 0,
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next() {
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if (this.i++ == 3) {
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return { done: true };
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}
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return { value: this.i, done: false };
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},
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};
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},
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};
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const a = [];
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for (const k of o) {
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a.push(k);
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}
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expect(a).toEqual([1, 2, 3]);
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});
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test("loops through custom iterator if there is an exception thrown part way through", () => {
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// This tests against the way custom iterators used to be implemented, where the values
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// were all collected at once before the for-of body was executed, instead of getting
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// the values one at a time
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const o = {
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[Symbol.iterator]() {
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return {
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i: 0,
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next() {
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if (this.i++ === 3) {
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throw new Error();
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}
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return { value: this.i };
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},
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};
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},
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};
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const a = [];
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try {
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for (let k of o) {
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a.push(k);
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}
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expect().fail();
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} catch (e) {
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expect(a).toEqual([1, 2, 3]);
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}
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});
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});
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describe("errors", () => {
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test("right hand side is a primitive", () => {
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expect(() => {
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for (const _ of 123) {
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}
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}).toThrowWithMessage(TypeError, "123 is not iterable");
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});
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test("right hand side is an object", () => {
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expect(() => {
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for (const _ of { foo: 1, bar: 2 }) {
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}
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}).toThrowWithMessage(TypeError, "[object Object] is not iterable");
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});
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});
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