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LibJS: Add TypedArray.prototype.@@iterator
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@ -61,6 +61,9 @@ void TypedArrayPrototype::initialize(GlobalObject& object)
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// 23.2.3.30 %TypedArray%.prototype.toString ( ), https://tc39.es/ecma262/#sec-%typedarray%.prototype.tostring
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define_direct_property(vm.names.toString, global_object().array_prototype()->get_without_side_effects(vm.names.toString), attr);
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// 23.2.3.32 %TypedArray%.prototype [ @@iterator ] ( ), https://tc39.es/ecma262/#sec-%typedarray%.prototype-@@iterator
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define_direct_property(*vm.well_known_symbol_iterator(), get_without_side_effects(vm.names.values), attr);
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}
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TypedArrayPrototype::~TypedArrayPrototype()
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@ -0,0 +1,89 @@
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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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const ALL_TYPED_ARRAYS = TYPED_ARRAYS.concat(BIGINT_TYPED_ARRAYS);
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describe("correct behavior", () => {
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test("length is 0", () => {
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ALL_TYPED_ARRAYS.forEach(T => {
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expect(T.prototype[Symbol.iterator]).toHaveLength(0);
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});
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});
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test("same value as %TypedArray%.prototype.values", () => {
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ALL_TYPED_ARRAYS.forEach(T => {
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expect(T.prototype[Symbol.iterator]).toBe(T.prototype.values);
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});
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});
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test("basic functionality", () => {
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TYPED_ARRAYS.forEach(T => {
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const typedArray = new T([1, 2, 3]);
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const iterator = typedArray[Symbol.iterator]();
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expect(iterator.next()).toEqual({ value: 1, done: false });
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expect(iterator.next()).toEqual({ value: 2, done: false });
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expect(iterator.next()).toEqual({ value: 3, done: false });
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expect(iterator.next()).toEqual({ value: undefined, done: true });
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expect(iterator.next()).toEqual({ value: undefined, done: true });
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expect(iterator.next()).toEqual({ value: undefined, done: true });
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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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const iterator = typedArray[Symbol.iterator]();
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expect(iterator.next()).toEqual({ value: 1n, done: false });
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expect(iterator.next()).toEqual({ value: 2n, done: false });
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expect(iterator.next()).toEqual({ value: 3n, done: false });
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expect(iterator.next()).toEqual({ value: undefined, done: true });
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expect(iterator.next()).toEqual({ value: undefined, done: true });
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expect(iterator.next()).toEqual({ value: undefined, done: true });
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});
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});
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test("can be iterated with for-of", () => {
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TYPED_ARRAYS.forEach(T => {
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const typedArray = new T([1, 2, 3]);
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const result = [];
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for (const value of typedArray) result.push(value);
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expect(result).toHaveLength(3);
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expect(result[0]).toBe(1);
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expect(result[1]).toBe(2);
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expect(result[2]).toBe(3);
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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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const result = [];
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for (const value of typedArray) result.push(value);
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expect(result).toHaveLength(3);
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expect(result[0]).toBe(1n);
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expect(result[1]).toBe(2n);
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expect(result[2]).toBe(3n);
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});
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});
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});
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describe("errors", () => {
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test("this value must be a TypedArray object", () => {
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ALL_TYPED_ARRAYS.forEach(T => {
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expect(() => {
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T.prototype[Symbol.iterator].call({});
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}).toThrowWithMessage(TypeError, "Not an object of type TypedArray");
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});
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});
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});
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