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LibJS: Add %TypedArray%.prototype.findIndex

This commit is contained in:
Luke 2021-06-18 03:58:59 +01:00 committed by Linus Groh
parent 61a8c19556
commit 91af985718
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.findIndex).toHaveLength(1);
});
BIGINT_TYPED_ARRAYS.forEach(T => {
expect(T.prototype.findIndex).toHaveLength(1);
});
});
describe("errors", () => {
function errorTests(T) {
test(`requires at least one argument (${T.name})`, () => {
expect(() => {
new T().findIndex();
}).toThrowWithMessage(
TypeError,
"TypedArray.prototype.findIndex() requires at least one argument"
);
});
test(`callback must be a function (${T.name})`, () => {
expect(() => {
new T().findIndex(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.findIndex(value => value === 1)).toBe(0);
expect(typedArray.findIndex(value => value === 2)).toBe(1);
expect(typedArray.findIndex(value => value === 3)).toBe(2);
expect(typedArray.findIndex((value, index) => index === 1)).toBe(1);
expect(typedArray.findIndex(value => value == "1")).toBe(0);
expect(typedArray.findIndex(value => value === 10)).toBe(-1);
});
BIGINT_TYPED_ARRAYS.forEach(T => {
const typedArray = new T([1n, 2n, 3n]);
expect(typedArray.findIndex(value => value === 1n)).toBe(0);
expect(typedArray.findIndex(value => value === 2n)).toBe(1);
expect(typedArray.findIndex(value => value === 3n)).toBe(2);
expect(typedArray.findIndex((value, index) => index === 1)).toBe(1);
expect(typedArray.findIndex(value => value == 1)).toBe(0);
expect(typedArray.findIndex(value => value == "1")).toBe(0);
expect(typedArray.findIndex(value => value === 1)).toBe(-1);
});
});
test("never calls callback with empty array", () => {
function emptyTest(T) {
var callbackCalled = 0;
expect(
new T().findIndex(() => {
callbackCalled++;
})
).toBe(-1);
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]).findIndex(() => {
callbackCalled++;
})
).toBe(-1);
expect(callbackCalled).toBe(3);
});
BIGINT_TYPED_ARRAYS.forEach(T => {
var callbackCalled = 0;
expect(
new T([1n, 2n, 3n]).findIndex(() => {
callbackCalled++;
})
).toBe(-1);
expect(callbackCalled).toBe(3);
});
});
});