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LibJS: Implement BigInt.asUintN

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This commit is contained in:
Timothy Flynn
2022-02-05 21:04:17 -05:00
committed by Linus Groh
parent 460c2caaf7
commit cb57475168
Notes: sideshowbarker 2024-07-17 19:42:42 +09:00 
Author: https://github.com/trflynn89
Commit: https://github.com/SerenityOS/serenity/commit/cb57475168e
Pull-request: https://github.com/SerenityOS/serenity/pull/12307
Reviewed-by: https://github.com/linusg ✅
2 changed files with 88 additions and 2 deletions
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77
Userland/Libraries/LibJS/Tests/builtins/BigInt/BigInt.asUintN.js Normal file
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describe("errors", () => {
test("invalid index", () => {
expect(() => {
BigInt.asUintN(-1, 0n);
}).toThrowWithMessage(RangeError, "Index must be a positive integer");
expect(() => {
BigInt.asUintN(Symbol(), 0n);
}).toThrowWithMessage(TypeError, "Cannot convert symbol to number");
});
test("invalid BigInt", () => {
expect(() => {
BigInt.asUintN(1, 1);
}).toThrowWithMessage(TypeError, "Cannot convert number to BigInt");
expect(() => {
BigInt.asUintN(1, Symbol());
}).toThrowWithMessage(TypeError, "Cannot convert symbol to BigInt");
expect(() => {
BigInt.asUintN(1, "foo");
}).toThrowWithMessage(SyntaxError, "Invalid value for BigInt: foo");
});
});
describe("correct behavior", () => {
test("basic functionality", () => {
expect(BigInt.asUintN(0, -2n)).toBe(0n);
expect(BigInt.asUintN(0, -1n)).toBe(0n);
expect(BigInt.asUintN(0, 0n)).toBe(0n);
expect(BigInt.asUintN(0, 1n)).toBe(0n);
expect(BigInt.asUintN(0, 2n)).toBe(0n);
expect(BigInt.asUintN(1, -3n)).toBe(1n);
expect(BigInt.asUintN(1, -2n)).toBe(0n);
expect(BigInt.asUintN(1, -1n)).toBe(1n);
expect(BigInt.asUintN(1, 0n)).toBe(0n);
expect(BigInt.asUintN(1, 1n)).toBe(1n);
expect(BigInt.asUintN(1, 2n)).toBe(0n);
expect(BigInt.asUintN(1, 3n)).toBe(1n);
expect(BigInt.asUintN(2, -3n)).toBe(1n);
expect(BigInt.asUintN(2, -2n)).toBe(2n);
expect(BigInt.asUintN(2, -1n)).toBe(3n);
expect(BigInt.asUintN(2, 0n)).toBe(0n);
expect(BigInt.asUintN(2, 1n)).toBe(1n);
expect(BigInt.asUintN(2, 2n)).toBe(2n);
expect(BigInt.asUintN(2, 3n)).toBe(3n);
expect(BigInt.asUintN(4, -3n)).toBe(13n);
expect(BigInt.asUintN(4, -2n)).toBe(14n);
expect(BigInt.asUintN(4, -1n)).toBe(15n);
expect(BigInt.asUintN(4, 0n)).toBe(0n);
expect(BigInt.asUintN(4, 1n)).toBe(1n);
expect(BigInt.asUintN(4, 2n)).toBe(2n);
expect(BigInt.asUintN(4, 3n)).toBe(3n);
const extremelyBigInt = 123456789123456789123456789123456789123456789123456789n;
expect(BigInt.asUintN(0, extremelyBigInt)).toBe(0n);
expect(BigInt.asUintN(1, extremelyBigInt)).toBe(1n);
expect(BigInt.asUintN(2, extremelyBigInt)).toBe(1n);
expect(BigInt.asUintN(4, extremelyBigInt)).toBe(5n);
expect(BigInt.asUintN(128, extremelyBigInt)).toBe(241220992521549204068304577237384191765n);
expect(BigInt.asUintN(256, extremelyBigInt)).toBe(extremelyBigInt);
expect(BigInt.asUintN(0, -extremelyBigInt)).toBe(0n);
expect(BigInt.asUintN(1, -extremelyBigInt)).toBe(1n);
expect(BigInt.asUintN(2, -extremelyBigInt)).toBe(3n);
expect(BigInt.asUintN(4, -extremelyBigInt)).toBe(11n);
expect(BigInt.asUintN(128, -extremelyBigInt)).toBe(99061374399389259395070030194384019691n);
expect(BigInt.asUintN(256, -extremelyBigInt)).toBe(
115792089237316195423570861551898784396480861208851440582668460551124006183147n
);
});
});