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LibJS: Add %TypedArray%.prototype.forEach
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3 changed files with 156 additions and 0 deletions
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const TYPED_ARRAYS = [
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Uint8Array,
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Uint16Array,
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Uint32Array,
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Int8Array,
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Int16Array,
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Int32Array,
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Float32Array,
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Float64Array,
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];
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const BIGINT_TYPED_ARRAYS = [BigUint64Array, BigInt64Array];
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test("length is 1", () => {
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TYPED_ARRAYS.forEach(T => {
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expect(T.prototype.forEach).toHaveLength(1);
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});
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BIGINT_TYPED_ARRAYS.forEach(T => {
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expect(T.prototype.forEach).toHaveLength(1);
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});
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});
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describe("errors", () => {
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function errorTests(T) {
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test(`requires at least one argument (${T.name})`, () => {
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expect(() => {
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new T().forEach();
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}).toThrowWithMessage(
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TypeError,
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"TypedArray.prototype.forEach() requires at least one argument"
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);
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});
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test(`callback must be a function (${T.name})`, () => {
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expect(() => {
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new T().forEach(undefined);
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}).toThrowWithMessage(TypeError, "undefined is not a function");
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});
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}
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TYPED_ARRAYS.forEach(T => errorTests(T));
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BIGINT_TYPED_ARRAYS.forEach(T => errorTests(T));
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});
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describe("normal behaviour", () => {
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test("never calls callback with empty array", () => {
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function emptyTest(T) {
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var callbackCalled = 0;
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expect(
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new T().forEach(() => {
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callbackCalled++;
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})
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).toBeUndefined();
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expect(callbackCalled).toBe(0);
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}
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TYPED_ARRAYS.forEach(T => emptyTest(T));
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BIGINT_TYPED_ARRAYS.forEach(T => emptyTest(T));
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});
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test("calls callback once for every item", () => {
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TYPED_ARRAYS.forEach(T => {
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var callbackCalled = 0;
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expect(
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new T([1, 2, 3]).forEach(() => {
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callbackCalled++;
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})
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).toBeUndefined();
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expect(callbackCalled).toBe(3);
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});
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BIGINT_TYPED_ARRAYS.forEach(T => {
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var callbackCalled = 0;
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expect(
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new T([1n, 2n, 3n]).forEach(() => {
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callbackCalled++;
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})
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).toBeUndefined();
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expect(callbackCalled).toBe(3);
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});
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});
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test("callback receives value and index", () => {
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TYPED_ARRAYS.forEach(T => {
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const typedArray = new T([1, 2, 3]);
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typedArray.forEach((value, index) => {
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expect(value).toBe(typedArray[index]);
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expect(index).toBe(typedArray[index] - 1);
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});
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});
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BIGINT_TYPED_ARRAYS.forEach(T => {
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const typedArray = new T([1n, 2n, 3n]);
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typedArray.forEach((value, index) => {
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expect(value).toBe(typedArray[index]);
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expect(index).toBe(parseInt(typedArray[index] - 1n));
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});
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});
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});
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test("callback receives array", () => {
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TYPED_ARRAYS.forEach(T => {
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var callbackCalled = 0;
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const typedArray = new T([1, 2, 3]);
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typedArray.forEach((_, __, array) => {
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callbackCalled++;
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expect(typedArray).toEqual(array);
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});
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expect(callbackCalled).toBe(3);
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});
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BIGINT_TYPED_ARRAYS.forEach(T => {
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var callbackCalled = 0;
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const typedArray = new T([1n, 2n, 3n]);
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typedArray.forEach((_, __, array) => {
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callbackCalled++;
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expect(typedArray).toEqual(array);
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});
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expect(callbackCalled).toBe(3);
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});
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});
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test("this value can be modified", () => {
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TYPED_ARRAYS.forEach(T => {
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const typedArray = new T([1, 2, 3]);
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[4, 5, 6].forEach(function (value, index) {
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this[index] = value;
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}, typedArray);
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expect(typedArray[0]).toBe(4);
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expect(typedArray[1]).toBe(5);
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expect(typedArray[2]).toBe(6);
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});
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BIGINT_TYPED_ARRAYS.forEach(T => {
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const typedArray = new T([1n, 2n, 3n]);
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[4n, 5n, 6n].forEach(function (value, index) {
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this[index] = value;
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}, typedArray);
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expect(typedArray[0]).toBe(4n);
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expect(typedArray[1]).toBe(5n);
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expect(typedArray[2]).toBe(6n);
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});
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});
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});
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