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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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@ -29,6 +29,7 @@ void TypedArrayPrototype::initialize(GlobalObject& object)
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define_native_function(vm.names.every, every, 1, attr);
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define_native_function(vm.names.find, find, 1, attr);
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define_native_function(vm.names.findIndex, find_index, 1, attr);
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define_native_function(vm.names.forEach, for_each, 1, attr);
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}
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TypedArrayPrototype::~TypedArrayPrototype()
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@ -169,6 +170,15 @@ JS_DEFINE_NATIVE_FUNCTION(TypedArrayPrototype::find_index)
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return Value(result_index);
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}
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// 23.2.3.12 %TypedArray%.prototype.forEach ( callbackfn [ , thisArg ] ), https://tc39.es/ecma262/#sec-%typedarray%.prototype.foreach
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JS_DEFINE_NATIVE_FUNCTION(TypedArrayPrototype::for_each)
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{
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for_each_item(vm, global_object, "forEach", [](auto, auto, auto) {
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return IterationDecision::Continue;
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});
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return js_undefined();
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}
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// 23.2.3.1 get %TypedArray%.prototype.buffer, https://tc39.es/ecma262/#sec-get-%typedarray%.prototype.buffer
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JS_DEFINE_NATIVE_GETTER(TypedArrayPrototype::buffer_getter)
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{
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@ -28,6 +28,7 @@ private:
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JS_DECLARE_NATIVE_FUNCTION(every);
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JS_DECLARE_NATIVE_FUNCTION(find);
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JS_DECLARE_NATIVE_FUNCTION(find_index);
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JS_DECLARE_NATIVE_FUNCTION(for_each);
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};
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}
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@ -0,0 +1,145 @@
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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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