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LibJS: Add %TypedArray%.prototype.find

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Luke 2021-06-18 03:57:53 +01:00 committed by Linus Groh
parent 65ca2d98af
commit 61a8c19556
3 changed files with 124 additions and 0 deletions

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const TYPED_ARRAYS = [
Uint8Array,
Uint16Array,
Uint32Array,
Int8Array,
Int16Array,
Int32Array,
Float32Array,
Float64Array,
];
const BIGINT_TYPED_ARRAYS = [BigUint64Array, BigInt64Array];
test("length is 1", () => {
TYPED_ARRAYS.forEach(T => {
expect(T.prototype.find).toHaveLength(1);
});
BIGINT_TYPED_ARRAYS.forEach(T => {
expect(T.prototype.find).toHaveLength(1);
});
});
describe("errors", () => {
function errorTests(T) {
test(`requires at least one argument (${T.name})`, () => {
expect(() => {
new T().find();
}).toThrowWithMessage(
TypeError,
"TypedArray.prototype.find() requires at least one argument"
);
});
test(`callback must be a function (${T.name})`, () => {
expect(() => {
new T().find(undefined);
}).toThrowWithMessage(TypeError, "undefined is not a function");
});
}
TYPED_ARRAYS.forEach(T => errorTests(T));
BIGINT_TYPED_ARRAYS.forEach(T => errorTests(T));
});
describe("normal behaviour", () => {
test("basic functionality", () => {
TYPED_ARRAYS.forEach(T => {
const typedArray = new T([1, 2, 3]);
expect(typedArray.find(value => value === 1)).toBe(1);
expect(typedArray.find(value => value === 2)).toBe(2);
expect(typedArray.find(value => value === 3)).toBe(3);
expect(typedArray.find((value, index) => index === 1)).toBe(2);
expect(typedArray.find(value => value == "1")).toBe(1);
expect(typedArray.find(value => value === 10)).toBeUndefined();
});
BIGINT_TYPED_ARRAYS.forEach(T => {
const typedArray = new T([1n, 2n, 3n]);
expect(typedArray.find(value => value === 1n)).toBe(1n);
expect(typedArray.find(value => value === 2n)).toBe(2n);
expect(typedArray.find(value => value === 3n)).toBe(3n);
expect(typedArray.find((value, index) => index === 1)).toBe(2n);
expect(typedArray.find(value => value == 1)).toBe(1n);
expect(typedArray.find(value => value == "1")).toBe(1n);
expect(typedArray.find(value => value === 1)).toBeUndefined();
});
});
test("never calls callback with empty array", () => {
function emptyTest(T) {
var callbackCalled = 0;
expect(
new T().find(() => {
callbackCalled++;
})
).toBeUndefined();
expect(callbackCalled).toBe(0);
}
TYPED_ARRAYS.forEach(T => emptyTest(T));
BIGINT_TYPED_ARRAYS.forEach(T => emptyTest(T));
});
test("calls callback once for every item", () => {
TYPED_ARRAYS.forEach(T => {
var callbackCalled = 0;
expect(
new T([1, 2, 3]).find(() => {
callbackCalled++;
})
).toBeUndefined();
expect(callbackCalled).toBe(3);
});
BIGINT_TYPED_ARRAYS.forEach(T => {
var callbackCalled = 0;
expect(
new T([1n, 2n, 3n]).find(() => {
callbackCalled++;
})
).toBeUndefined();
expect(callbackCalled).toBe(3);
});
});
});