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https://github.com/RGBCube/serenity
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LibJS: Implement proposed TypedArray.prototype.findLast{,Index}
Proposal: https://tc39.es/proposal-array-find-from-last/
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4 changed files with 302 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.findLast).toHaveLength(1);
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});
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BIGINT_TYPED_ARRAYS.forEach(T => {
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expect(T.prototype.findLast).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 (${T.name})`, () => {
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expect(() => {
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new T().findLast();
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}).toThrowWithMessage(
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TypeError,
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"TypedArray.prototype.findLast() requires at least one argument"
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);
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});
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test(`callback must be a function (${T.name})`, () => {
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expect(() => {
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new T().findLast(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.findLast(value => value === 1)).toBe(1);
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expect(typedArray.findLast(value => value === 2)).toBe(2);
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expect(typedArray.findLast(value => value === 3)).toBe(3);
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expect(typedArray.findLast((value, index) => index === 1)).toBe(2);
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expect(typedArray.findLast(value => value == "1")).toBe(1);
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expect(typedArray.findLast(value => value === 10)).toBeUndefined();
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const typedArrayDuplicates = new T([2, 1, 2, 3, 1]);
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expect(typedArrayDuplicates.findLast(value => value < 3)).toBe(1);
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expect(typedArrayDuplicates.findLast(value => value < 2)).toBe(1);
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expect(typedArrayDuplicates.findLast(value => value > 1)).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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expect(typedArray.findLast(value => value === 1n)).toBe(1n);
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expect(typedArray.findLast(value => value === 2n)).toBe(2n);
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expect(typedArray.findLast(value => value === 3n)).toBe(3n);
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expect(typedArray.findLast((value, index) => index === 1)).toBe(2n);
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expect(typedArray.findLast(value => value == 1)).toBe(1n);
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expect(typedArray.findLast(value => value == "1")).toBe(1n);
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expect(typedArray.findLast(value => value === 1)).toBeUndefined();
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const typedArrayDuplicates = new T([2n, 1n, 2n, 3n, 1n]);
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expect(typedArrayDuplicates.findLast(value => value < 3)).toBe(1n);
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expect(typedArrayDuplicates.findLast(value => value < 2)).toBe(1n);
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expect(typedArrayDuplicates.findLast(value => value > 1)).toBe(3n);
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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().findLast(() => {
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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]).findLast(() => {
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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]).findLast(() => {
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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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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.findLastIndex).toHaveLength(1);
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});
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BIGINT_TYPED_ARRAYS.forEach(T => {
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expect(T.prototype.findLastIndex).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 (${T.name})`, () => {
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expect(() => {
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new T().findLastIndex();
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}).toThrowWithMessage(
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TypeError,
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"TypedArray.prototype.findLastIndex() requires at least one argument"
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);
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});
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test(`callback must be a function (${T.name})`, () => {
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expect(() => {
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new T().findLastIndex(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.findLastIndex(value => value === 1)).toBe(0);
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expect(typedArray.findLastIndex(value => value === 2)).toBe(1);
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expect(typedArray.findLastIndex(value => value === 3)).toBe(2);
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expect(typedArray.findLastIndex((value, index) => index === 1)).toBe(1);
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expect(typedArray.findLastIndex(value => value == "1")).toBe(0);
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expect(typedArray.findLastIndex(value => value === 10)).toBe(-1);
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const typedArrayDuplicates = new T([1, 2, 3, 1]);
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expect(typedArrayDuplicates.findLastIndex(value => value === 1)).toBe(3);
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expect(typedArrayDuplicates.findLastIndex(value => value === 2)).toBe(1);
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expect(typedArrayDuplicates.findLastIndex(value => value === 3)).toBe(2);
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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.findLastIndex(value => value === 1n)).toBe(0);
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expect(typedArray.findLastIndex(value => value === 2n)).toBe(1);
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expect(typedArray.findLastIndex(value => value === 3n)).toBe(2);
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expect(typedArray.findLastIndex((value, index) => index === 1)).toBe(1);
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expect(typedArray.findLastIndex(value => value == 1)).toBe(0);
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expect(typedArray.findLastIndex(value => value == "1")).toBe(0);
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expect(typedArray.findLastIndex(value => value === 1)).toBe(-1);
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const typedArrayDuplicates = new T([1n, 2n, 3n, 1n]);
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expect(typedArrayDuplicates.findLastIndex(value => value === 1n)).toBe(3);
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expect(typedArrayDuplicates.findLastIndex(value => value === 2n)).toBe(1);
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expect(typedArrayDuplicates.findLastIndex(value => value === 3n)).toBe(2);
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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().findLastIndex(() => {
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callbackCalled++;
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})
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).toBe(-1);
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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]).findLastIndex(() => {
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callbackCalled++;
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})
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).toBe(-1);
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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]).findLastIndex(() => {
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callbackCalled++;
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})
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).toBe(-1);
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expect(callbackCalled).toBe(3);
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});
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});
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});
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