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LibJS: Add TypedArray.prototype.@@iterator

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Luke Wilde 2021-12-21 14:26:53 +00:00 • committed by Linus Groh
parent 4fe47ed86e
commit 6d5531112f
2 changed files with 92 additions and 0 deletions
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3
Userland/Libraries/LibJS/Runtime/TypedArrayPrototype.cpp
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@ -61,6 +61,9 @@ void TypedArrayPrototype::initialize(GlobalObject& object)
// 23.2.3.30 %TypedArray%.prototype.toString ( ), https://tc39.es/ecma262/#sec-%typedarray%.prototype.tostring
define_direct_property(vm.names.toString, global_object().array_prototype()->get_without_side_effects(vm.names.toString), attr);
// 23.2.3.32 %TypedArray%.prototype [ @@iterator ] ( ), https://tc39.es/ecma262/#sec-%typedarray%.prototype-@@iterator
define_direct_property(*vm.well_known_symbol_iterator(), get_without_side_effects(vm.names.values), attr);
}
TypedArrayPrototype::~TypedArrayPrototype()

89
Userland/Libraries/LibJS/Tests/builtins/TypedArray/TypedArray.prototype.@@iterator.js Normal file
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@ -0,0 +1,89 @@
const TYPED_ARRAYS = [
Uint8Array,
Uint8ClampedArray,
Uint16Array,
Uint32Array,
Int8Array,
Int16Array,
Int32Array,
Float32Array,
Float64Array,
];
const BIGINT_TYPED_ARRAYS = [BigUint64Array, BigInt64Array];
const ALL_TYPED_ARRAYS = TYPED_ARRAYS.concat(BIGINT_TYPED_ARRAYS);
describe("correct behavior", () => {
test("length is 0", () => {
ALL_TYPED_ARRAYS.forEach(T => {
expect(T.prototype[Symbol.iterator]).toHaveLength(0);
});
});
test("same value as %TypedArray%.prototype.values", () => {
ALL_TYPED_ARRAYS.forEach(T => {
expect(T.prototype[Symbol.iterator]).toBe(T.prototype.values);
});
});
test("basic functionality", () => {
TYPED_ARRAYS.forEach(T => {
const typedArray = new T([1, 2, 3]);
const iterator = typedArray[Symbol.iterator]();
expect(iterator.next()).toEqual({ value: 1, done: false });
expect(iterator.next()).toEqual({ value: 2, done: false });
expect(iterator.next()).toEqual({ value: 3, done: false });
expect(iterator.next()).toEqual({ value: undefined, done: true });
expect(iterator.next()).toEqual({ value: undefined, done: true });
expect(iterator.next()).toEqual({ value: undefined, done: true });
});
BIGINT_TYPED_ARRAYS.forEach(T => {
const typedArray = new T([1n, 2n, 3n]);
const iterator = typedArray[Symbol.iterator]();
expect(iterator.next()).toEqual({ value: 1n, done: false });
expect(iterator.next()).toEqual({ value: 2n, done: false });
expect(iterator.next()).toEqual({ value: 3n, done: false });
expect(iterator.next()).toEqual({ value: undefined, done: true });
expect(iterator.next()).toEqual({ value: undefined, done: true });
expect(iterator.next()).toEqual({ value: undefined, done: true });
});
});
test("can be iterated with for-of", () => {
TYPED_ARRAYS.forEach(T => {
const typedArray = new T([1, 2, 3]);
const result = [];
for (const value of typedArray) result.push(value);
expect(result).toHaveLength(3);
expect(result[0]).toBe(1);
expect(result[1]).toBe(2);
expect(result[2]).toBe(3);
});
BIGINT_TYPED_ARRAYS.forEach(T => {
const typedArray = new T([1n, 2n, 3n]);
const result = [];
for (const value of typedArray) result.push(value);
expect(result).toHaveLength(3);
expect(result[0]).toBe(1n);
expect(result[1]).toBe(2n);
expect(result[2]).toBe(3n);
});
});
});
describe("errors", () => {
test("this value must be a TypedArray object", () => {
ALL_TYPED_ARRAYS.forEach(T => {
expect(() => {
T.prototype[Symbol.iterator].call({});
}).toThrowWithMessage(TypeError, "Not an object of type TypedArray");
});
});
});