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LibJS: Add %TypedArray%.prototype.map
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3 changed files with 311 additions and 0 deletions
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const TYPED_ARRAYS = [
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Uint8Array,
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Uint8ClampedArray,
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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.map).toHaveLength(1);
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});
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BIGINT_TYPED_ARRAYS.forEach(T => {
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expect(T.prototype.map).toHaveLength(1);
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});
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});
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describe("errors", () => {
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function argumentErrorTests(T) {
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test(`requires at least one argument (${T.name})`, () => {
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expect(() => {
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new T().map();
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}).toThrowWithMessage(
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TypeError,
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"TypedArray.prototype.map() requires at least one argument"
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);
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});
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test(`callback must be a function (${T.name})`, () => {
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expect(() => {
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new T().map(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 => argumentErrorTests(T));
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BIGINT_TYPED_ARRAYS.forEach(T => argumentErrorTests(T));
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test("throws if mappedValue is not the same type of the typed array", () => {
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TYPED_ARRAYS.forEach(T => {
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let callbackCalled = 0;
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let result;
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expect(() => {
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result = new T([1, 2, 3]).map((value, index) => {
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callbackCalled++;
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return index % 2 === 0 ? 1n : 1;
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});
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}).toThrowWithMessage(TypeError, "Cannot convert BigInt to number");
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expect(callbackCalled).toBe(1);
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expect(result).toBeUndefined();
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});
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BIGINT_TYPED_ARRAYS.forEach(T => {
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let callbackCalled = 0;
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let result;
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expect(() => {
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result = new T([1n, 2n, 3n]).map((value, index) => {
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callbackCalled++;
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return index % 2 === 0 ? 1 : 1n;
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});
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}).toThrowWithMessage(TypeError, "Cannot convert number to BigInt");
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expect(callbackCalled).toBe(1);
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expect(result).toBeUndefined();
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});
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});
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test("Symbol.species returns a typed array with a different content type", () => {
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TYPED_ARRAYS.forEach(T => {
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class TypedArray extends T {
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static get [Symbol.species]() {
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return BigUint64Array;
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}
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}
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let result;
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expect(() => {
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result = new TypedArray().map(() => {});
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}).toThrowWithMessage(TypeError, `Can't create BigUint64Array from ${T.name}`);
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expect(result).toBeUndefined();
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});
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BIGINT_TYPED_ARRAYS.forEach(T => {
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class TypedArray extends T {
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static get [Symbol.species]() {
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return Uint32Array;
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}
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}
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let result;
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expect(() => {
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result = new TypedArray().map(() => {});
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}).toThrowWithMessage(TypeError, `Can't create Uint32Array from ${T.name}`);
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expect(result).toBeUndefined();
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});
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});
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test("Symbol.species doesn't return a typed array", () => {
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TYPED_ARRAYS.forEach(T => {
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class TypedArray extends T {
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static get [Symbol.species]() {
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return Array;
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}
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}
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let result;
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expect(() => {
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result = new TypedArray().map(() => {});
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}).toThrowWithMessage(TypeError, "Not a TypedArray object");
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expect(result).toBeUndefined();
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});
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BIGINT_TYPED_ARRAYS.forEach(T => {
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class TypedArray extends T {
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static get [Symbol.species]() {
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return Array;
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}
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}
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let result;
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expect(() => {
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result = new TypedArray().map(() => {});
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}).toThrowWithMessage(TypeError, "Not a TypedArray object");
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expect(result).toBeUndefined();
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});
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});
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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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TYPED_ARRAYS.forEach(T => {
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let callbackCalled = 0;
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expect(
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new T([]).map(() => {
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callbackCalled++;
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})
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).toHaveLength(0);
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expect(callbackCalled).toBe(0);
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});
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BIGINT_TYPED_ARRAYS.forEach(T => {
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let callbackCalled = 0;
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expect(
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new T([]).map(() => {
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callbackCalled++;
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})
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).toHaveLength(0);
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expect(callbackCalled).toBe(0);
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});
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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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let callbackCalled = 0;
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expect(
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new T([1, 2, 3]).map(value => {
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callbackCalled++;
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// NOTE: This is just to prevent a conversion exception.
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return value;
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})
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).toHaveLength(3);
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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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let callbackCalled = 0;
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expect(
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new T([1n, 2n, 3n]).map(value => {
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callbackCalled++;
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// NOTE: This is just to prevent a conversion exception.
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return value;
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})
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).toHaveLength(3);
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expect(callbackCalled).toBe(3);
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});
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});
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test("can map based on callback return value", () => {
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TYPED_ARRAYS.forEach(T => {
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const squaredNumbers = new T([0, 1, 2, 3, 4]).map(x => x ** 2);
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expect(squaredNumbers).toHaveLength(5);
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expect(squaredNumbers[0]).toBe(0);
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expect(squaredNumbers[1]).toBe(1);
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expect(squaredNumbers[2]).toBe(4);
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expect(squaredNumbers[3]).toBe(9);
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expect(squaredNumbers[4]).toBe(16);
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});
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BIGINT_TYPED_ARRAYS.forEach(T => {
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const squaredNumbers = new T([0n, 1n, 2n, 3n, 4n]).map(x => x ** 2n);
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expect(squaredNumbers).toHaveLength(5);
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expect(squaredNumbers[0]).toBe(0n);
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expect(squaredNumbers[1]).toBe(1n);
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expect(squaredNumbers[2]).toBe(4n);
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expect(squaredNumbers[3]).toBe(9n);
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expect(squaredNumbers[4]).toBe(16n);
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});
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});
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test("Symbol.species returns a typed array with a matching content type", () => {
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TYPED_ARRAYS.forEach(T => {
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class TypedArray extends T {
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static get [Symbol.species]() {
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return Uint32Array;
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}
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}
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let result;
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expect(() => {
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result = new TypedArray([1, 2, 3]).map(value => value + 2);
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}).not.toThrowWithMessage(TypeError, `Can't create Uint32Array from ${T.name}`);
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expect(result).toBeInstanceOf(Uint32Array);
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expect(result).toHaveLength(3);
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expect(result[0]).toBe(3);
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expect(result[1]).toBe(4);
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expect(result[2]).toBe(5);
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});
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BIGINT_TYPED_ARRAYS.forEach(T => {
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class TypedArray extends T {
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static get [Symbol.species]() {
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return BigUint64Array;
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}
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}
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let result;
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expect(() => {
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result = new TypedArray([1n, 2n, 3n]).map(value => value + 2n);
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}).not.toThrowWithMessage(TypeError, `Can't create BigUint64Array from ${T.name}`);
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expect(result).toBeInstanceOf(BigUint64Array);
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expect(result).toHaveLength(3);
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expect(result[0]).toBe(3n);
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expect(result[1]).toBe(4n);
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expect(result[2]).toBe(5n);
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});
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});
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});
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