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LibJS: Add %TypedArray%.prototype.find
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3 changed files with 124 additions and 0 deletions
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@ -27,6 +27,7 @@ void TypedArrayPrototype::initialize(GlobalObject& object)
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define_native_accessor(vm.names.byteOffset, byte_offset_getter, nullptr, Attribute::Configurable);
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define_native_function(vm.names.at, at, 1, attr);
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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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}
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TypedArrayPrototype::~TypedArrayPrototype()
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@ -139,6 +140,20 @@ JS_DEFINE_NATIVE_FUNCTION(TypedArrayPrototype::every)
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return Value(result);
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}
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// 23.2.3.10 %TypedArray%.prototype.find ( predicate [ , thisArg ] ), https://tc39.es/ecma262/#sec-%typedarray%.prototype.find
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JS_DEFINE_NATIVE_FUNCTION(TypedArrayPrototype::find)
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{
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auto result = js_undefined();
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for_each_item(vm, global_object, "find", [&](auto, auto value, auto callback_result) {
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if (callback_result.to_boolean()) {
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result = value;
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return IterationDecision::Break;
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}
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return IterationDecision::Continue;
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});
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return result;
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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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@ -26,6 +26,7 @@ private:
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JS_DECLARE_NATIVE_FUNCTION(at);
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JS_DECLARE_NATIVE_FUNCTION(every);
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JS_DECLARE_NATIVE_FUNCTION(find);
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};
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}
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@ -0,0 +1,108 @@
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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.find).toHaveLength(1);
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});
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BIGINT_TYPED_ARRAYS.forEach(T => {
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expect(T.prototype.find).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 (${T.name})`, () => {
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expect(() => {
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new T().find();
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}).toThrowWithMessage(
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TypeError,
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"TypedArray.prototype.find() requires at least one argument"
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);
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});
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test(`callback must be a function (${T.name})`, () => {
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expect(() => {
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new T().find(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("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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expect(typedArray.find(value => value === 1)).toBe(1);
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expect(typedArray.find(value => value === 2)).toBe(2);
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expect(typedArray.find(value => value === 3)).toBe(3);
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expect(typedArray.find((value, index) => index === 1)).toBe(2);
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expect(typedArray.find(value => value == "1")).toBe(1);
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expect(typedArray.find(value => value === 10)).toBeUndefined();
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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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expect(typedArray.find(value => value === 1n)).toBe(1n);
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expect(typedArray.find(value => value === 2n)).toBe(2n);
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expect(typedArray.find(value => value === 3n)).toBe(3n);
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expect(typedArray.find((value, index) => index === 1)).toBe(2n);
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expect(typedArray.find(value => value == 1)).toBe(1n);
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expect(typedArray.find(value => value == "1")).toBe(1n);
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expect(typedArray.find(value => value === 1)).toBeUndefined();
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});
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});
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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().find(() => {
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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]).find(() => {
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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]).find(() => {
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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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});
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