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LibJS: Implement Array.prototype.toReversed()
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5 changed files with 85 additions and 0 deletions
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@ -252,6 +252,7 @@ describe("ability to work with generic non-array objects", () => {
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});
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test("reverse", () => {
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const o = { length: 5, 0: "foo", 1: "bar", 3: "baz" };
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expect(Array.prototype.reverse.call(o)).toEqual({
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length: 5,
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4: "foo",
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@ -341,4 +342,10 @@ describe("ability to work with generic non-array objects", () => {
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const trueResult = result.get(trueObject);
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expect(trueResult).toEqual(["bar", "baz"]);
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});
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test("toReversed", () => {
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const result = Array.prototype.toReversed.call(o);
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expect(result).toEqual([undefined, "baz", undefined, "bar", "foo"]);
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expect(result).not.toBe(o);
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});
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});
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@ -0,0 +1,39 @@
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describe("normal behavior", () => {
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test("length is 0", () => {
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expect(Array.prototype.toReversed).toHaveLength(0);
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});
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test("basic functionality", () => {
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const a = [1, 2, 3, 4, 5];
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const b = a.toReversed();
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expect(a).not.toBe(b);
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expect(a).toEqual([1, 2, 3, 4, 5]);
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expect(b).toEqual([5, 4, 3, 2, 1]);
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});
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test("is unscopable", () => {
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expect(Array.prototype[Symbol.unscopables].toReversed).toBeTrue();
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const array = [];
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with (array) {
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expect(() => {
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toReversed;
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}).toThrowWithMessage(ReferenceError, "'toReversed' is not defined");
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}
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});
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});
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describe("errors", () => {
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test("null or undefined this value", () => {
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expect(() => {
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Array.prototype.toReversed.call();
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}).toThrowWithMessage(TypeError, "ToObject on null or undefined");
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expect(() => {
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Array.prototype.toReversed.call(undefined);
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}).toThrowWithMessage(TypeError, "ToObject on null or undefined");
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expect(() => {
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Array.prototype.toReversed.call(null);
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}).toThrowWithMessage(TypeError, "ToObject on null or undefined");
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});
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});
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