Libraries: Move to Userland/Libraries/

Userland/Libraries/LibJS/Tests/operators/assignment-operators.js

@@ -0,0 +1,135 @@
+let x, o;
+
+test("basic functionality", () => {
+    x = 1;
+    expect((x = 2)).toBe(2);
+    expect(x).toBe(2);
+
+    x = 1;
+    expect((x += 2)).toBe(3);
+    expect(x).toBe(3);
+
+    x = 3;
+    expect((x -= 2)).toBe(1);
+    expect(x).toBe(1);
+
+    x = 3;
+    expect((x *= 2)).toBe(6);
+    expect(x).toBe(6);
+
+    x = 6;
+    expect((x /= 2)).toBe(3);
+    expect(x).toBe(3);
+
+    x = 6;
+    expect((x %= 4)).toBe(2);
+    expect(x).toBe(2);
+
+    x = 2;
+    expect((x **= 3)).toBe(8);
+    expect(x).toBe(8);
+
+    x = 3;
+    expect((x &= 2)).toBe(2);
+    expect(x).toBe(2);
+
+    x = 3;
+    expect((x |= 4)).toBe(7);
+    expect(x).toBe(7);
+
+    x = 6;
+    expect((x ^= 2)).toBe(4);
+    expect(x).toBe(4);
+
+    x = 2;
+    expect((x <<= 2)).toBe(8);
+    expect(x).toBe(8);
+
+    x = 8;
+    expect((x >>= 2)).toBe(2);
+    expect(x).toBe(2);
+
+    x = -(2 ** 32 - 10);
+    expect((x >>>= 2)).toBe(2);
+    expect(x).toBe(2);
+});
+
+test("logical assignment operators", () => {
+    // short circuiting evaluation
+    x = false;
+    expect((x &&= expect.fail())).toBeFalse();
+
+    x = true;
+    expect((x ||= expect.fail())).toBeTrue();
+
+    x = "foo";
+    expect((x ??= expect.fail())).toBe("foo");
+
+    const prepareObject = (shortCircuitValue, assignmentValue) => ({
+        get shortCircuit() {
+            return shortCircuitValue;
+        },
+        set shortCircuit(_) {
+            // assignment will short circuit in all test cases
+            // so its setter must never be called
+            expect().fail();
+        },
+        assignment: assignmentValue,
+    });
+
+    o = prepareObject(false, true);
+    expect((o.shortCircuit &&= "foo")).toBeFalse();
+    expect(o.shortCircuit).toBeFalse();
+    expect((o.assignment &&= "bar")).toBe("bar");
+    expect(o.assignment).toBe("bar");
+
+    o = prepareObject(true, false);
+    expect((o.shortCircuit ||= "foo")).toBeTrue();
+    expect(o.shortCircuit).toBeTrue();
+    expect((o.assignment ||= "bar")).toBe("bar");
+    expect(o.assignment).toBe("bar");
+
+    o = prepareObject("test", null);
+    expect((o.shortCircuit ??= "foo")).toBe("test");
+    expect(o.shortCircuit).toBe("test");
+    expect((o.assignment ??= "bar")).toBe("bar");
+    expect(o.assignment).toBe("bar");
+});
+
+test("evaluation order", () => {
+    for (const op of [
+        "=",
+        "+=",
+        "-=",
+        "*=",
+        "/=",
+        "%=",
+        "**=",
+        "&=",
+        "|=",
+        "^=",
+        "<<=",
+        ">>=",
+        ">>>=",
+        "&&=",
+        "||=",
+        "??=",
+    ]) {
+        var a = [];
+        function b() {
+            b.hasBeenCalled = true;
+            throw Error();
+        }
+        function c() {
+            c.hasBeenCalled = true;
+            throw Error();
+        }
+        b.hasBeenCalled = false;
+        c.hasBeenCalled = false;
+        expect(() => {
+            new Function(`a[b()] ${op} c()`)();
+        }).toThrow(Error);
+        expect(b.hasBeenCalled).toBeTrue();
+        expect(c.hasBeenCalled).toBeFalse();
+    }
+});

Userland/Libraries/LibJS/Tests/operators/binary-bitwise-and.js

@@ -0,0 +1,60 @@
+test("basic numeric and", () => {
+    expect(0 & 0).toBe(0);
+    expect(0 & 1).toBe(0);
+    expect(0 & 2).toBe(0);
+    expect(0 & 3).toBe(0);
+    expect(0 & 4).toBe(0);
+    expect(0 & 5).toBe(0);
+
+    expect(1 & 0).toBe(0);
+    expect(1 & 1).toBe(1);
+    expect(1 & 2).toBe(0);
+    expect(1 & 3).toBe(1);
+    expect(1 & 4).toBe(0);
+    expect(1 & 5).toBe(1);
+
+    expect(2 & 0).toBe(0);
+    expect(2 & 1).toBe(0);
+    expect(2 & 2).toBe(2);
+    expect(2 & 3).toBe(2);
+    expect(2 & 4).toBe(0);
+    expect(2 & 5).toBe(0);
+
+    expect(3 & 0).toBe(0);
+    expect(3 & 1).toBe(1);
+    expect(3 & 2).toBe(2);
+    expect(3 & 3).toBe(3);
+    expect(3 & 4).toBe(0);
+    expect(3 & 5).toBe(1);
+
+    expect(4 & 0).toBe(0);
+    expect(4 & 1).toBe(0);
+    expect(4 & 2).toBe(0);
+    expect(4 & 3).toBe(0);
+    expect(4 & 4).toBe(4);
+    expect(4 & 5).toBe(4);
+
+    expect(5 & 0).toBe(0);
+    expect(5 & 1).toBe(1);
+    expect(5 & 2).toBe(0);
+    expect(5 & 3).toBe(1);
+    expect(5 & 4).toBe(4);
+    expect(5 & 5).toBe(5);
+});
+
+test("and with non-numeric values", () => {
+    let x = 3;
+    let y = 7;
+
+    expect("42" & 6).toBe(2);
+    expect(x & y).toBe(3);
+    expect(x & [[[[13]]]]).toBe(1);
+    expect(undefined & y).toBe(0);
+    expect("a" & "b").toBe(0);
+    expect(null & null).toBe(0);
+    expect(undefined & undefined).toBe(0);
+    expect(NaN & NaN).toBe(0);
+    expect(NaN & 6).toBe(0);
+    expect(Infinity & Infinity).toBe(0);
+    expect(-Infinity & Infinity).toBe(0);
+});

Userland/Libraries/LibJS/Tests/operators/binary-bitwise-left-shift.js

@@ -0,0 +1,60 @@
+test("basic numeric shifting", () => {
+    expect(0 << 0).toBe(0);
+    expect(0 << 1).toBe(0);
+    expect(0 << 2).toBe(0);
+    expect(0 << 3).toBe(0);
+    expect(0 << 4).toBe(0);
+    expect(0 << 5).toBe(0);
+
+    expect(1 << 0).toBe(1);
+    expect(1 << 1).toBe(2);
+    expect(1 << 2).toBe(4);
+    expect(1 << 3).toBe(8);
+    expect(1 << 4).toBe(16);
+    expect(1 << 5).toBe(32);
+
+    expect(2 << 0).toBe(2);
+    expect(2 << 1).toBe(4);
+    expect(2 << 2).toBe(8);
+    expect(2 << 3).toBe(16);
+    expect(2 << 4).toBe(32);
+    expect(2 << 5).toBe(64);
+
+    expect(3 << 0).toBe(3);
+    expect(3 << 1).toBe(6);
+    expect(3 << 2).toBe(12);
+    expect(3 << 3).toBe(24);
+    expect(3 << 4).toBe(48);
+    expect(3 << 5).toBe(96);
+
+    expect(4 << 0).toBe(4);
+    expect(4 << 1).toBe(8);
+    expect(4 << 2).toBe(16);
+    expect(4 << 3).toBe(32);
+    expect(4 << 4).toBe(64);
+    expect(4 << 5).toBe(128);
+
+    expect(5 << 0).toBe(5);
+    expect(5 << 1).toBe(10);
+    expect(5 << 2).toBe(20);
+    expect(5 << 3).toBe(40);
+    expect(5 << 4).toBe(80);
+    expect(5 << 5).toBe(160);
+});
+
+test("shifting with non-numeric values", () => {
+    let x = 3;
+    let y = 7;
+
+    expect("42" << 6).toBe(2688);
+    expect(x << y).toBe(384);
+    expect(x << [[[[12]]]]).toBe(12288);
+    expect(undefined << y).toBe(0);
+    expect("a" << "b").toBe(0);
+    expect(null << null).toBe(0);
+    expect(undefined << undefined).toBe(0);
+    expect(NaN << NaN).toBe(0);
+    expect(NaN << 6).toBe(0);
+    expect(Infinity << Infinity).toBe(0);
+    expect(-Infinity << Infinity).toBe(0);
+});

Userland/Libraries/LibJS/Tests/operators/binary-bitwise-or.js

@@ -0,0 +1,60 @@
+test("basic numeric or", () => {
+    expect(0 | 0).toBe(0);
+    expect(0 | 1).toBe(1);
+    expect(0 | 2).toBe(2);
+    expect(0 | 3).toBe(3);
+    expect(0 | 4).toBe(4);
+    expect(0 | 5).toBe(5);
+
+    expect(1 | 0).toBe(1);
+    expect(1 | 1).toBe(1);
+    expect(1 | 2).toBe(3);
+    expect(1 | 3).toBe(3);
+    expect(1 | 4).toBe(5);
+    expect(1 | 5).toBe(5);
+
+    expect(2 | 0).toBe(2);
+    expect(2 | 1).toBe(3);
+    expect(2 | 2).toBe(2);
+    expect(2 | 3).toBe(3);
+    expect(2 | 4).toBe(6);
+    expect(2 | 5).toBe(7);
+
+    expect(3 | 0).toBe(3);
+    expect(3 | 1).toBe(3);
+    expect(3 | 2).toBe(3);
+    expect(3 | 3).toBe(3);
+    expect(3 | 4).toBe(7);
+    expect(3 | 5).toBe(7);
+
+    expect(4 | 0).toBe(4);
+    expect(4 | 1).toBe(5);
+    expect(4 | 2).toBe(6);
+    expect(4 | 3).toBe(7);
+    expect(4 | 4).toBe(4);
+    expect(4 | 5).toBe(5);
+
+    expect(5 | 0).toBe(5);
+    expect(5 | 1).toBe(5);
+    expect(5 | 2).toBe(7);
+    expect(5 | 3).toBe(7);
+    expect(5 | 4).toBe(5);
+    expect(5 | 5).toBe(5);
+});
+
+test("or with non-numeric values", () => {
+    let x = 3;
+    let y = 7;
+
+    expect("42" | 6).toBe(46);
+    expect(x | y).toBe(7);
+    expect(x | [[[[12]]]]).toBe(15);
+    expect(undefined | y).toBe(7);
+    expect("a" | "b").toBe(0);
+    expect(null | null).toBe(0);
+    expect(undefined | undefined).toBe(0);
+    expect(NaN | NaN).toBe(0);
+    expect(NaN | 6).toBe(6);
+    expect(Infinity | Infinity).toBe(0);
+    expect(-Infinity | Infinity).toBe(0);
+});

Userland/Libraries/LibJS/Tests/operators/binary-bitwise-right-shift.js

@@ -0,0 +1,62 @@
+test("basic numeric shifting", () => {
+    expect(0 >> 0).toBe(0);
+    expect(0 >> 1).toBe(0);
+    expect(0 >> 2).toBe(0);
+    expect(0 >> 3).toBe(0);
+    expect(0 >> 4).toBe(0);
+    expect(0 >> 5).toBe(0);
+
+    expect(1 >> 0).toBe(1);
+    expect(1 >> 1).toBe(0);
+    expect(1 >> 2).toBe(0);
+    expect(1 >> 3).toBe(0);
+    expect(1 >> 4).toBe(0);
+    expect(1 >> 5).toBe(0);
+
+    expect(5 >> 0).toBe(5);
+    expect(5 >> 1).toBe(2);
+    expect(5 >> 2).toBe(1);
+    expect(5 >> 3).toBe(0);
+    expect(5 >> 4).toBe(0);
+    expect(5 >> 5).toBe(0);
+
+    expect(42 >> 0).toBe(42);
+    expect(42 >> 1).toBe(21);
+    expect(42 >> 2).toBe(10);
+    expect(42 >> 3).toBe(5);
+    expect(42 >> 4).toBe(2);
+    expect(42 >> 5).toBe(1);
+});
+
+test("numeric shifting with negative lhs values", () => {
+    expect(-1 >> 0).toBe(-1);
+    expect(-1 >> 1).toBe(-1);
+    expect(-1 >> 2).toBe(-1);
+    expect(-1 >> 3).toBe(-1);
+    expect(-1 >> 4).toBe(-1);
+    expect(-1 >> 5).toBe(-1);
+
+    expect(-5 >> 0).toBe(-5);
+    expect(-5 >> 1).toBe(-3);
+    expect(-5 >> 2).toBe(-2);
+    expect(-5 >> 3).toBe(-1);
+    expect(-5 >> 4).toBe(-1);
+    expect(-5 >> 5).toBe(-1);
+});
+
+test("shifting with non-numeric values", () => {
+    let x = 67;
+    let y = 4;
+
+    expect("42" >> 3).toBe(5);
+    expect(x >> y).toBe(4);
+    expect(x >> [[[[5]]]]).toBe(2);
+    expect(undefined >> y).toBe(0);
+    expect("a" >> "b").toBe(0);
+    expect(null >> null).toBe(0);
+    expect(undefined >> undefined).toBe(0);
+    expect(NaN >> NaN).toBe(0);
+    expect(6 >> NaN).toBe(6);
+    expect(Infinity >> Infinity).toBe(0);
+    expect(-Infinity >> Infinity).toBe(0);
+});

Userland/Libraries/LibJS/Tests/operators/binary-bitwise-unsigned-right-shift.js

@@ -0,0 +1,62 @@
+test("basic numeric shifting", () => {
+    expect(0 >>> 0).toBe(0);
+    expect(0 >>> 1).toBe(0);
+    expect(0 >>> 2).toBe(0);
+    expect(0 >>> 3).toBe(0);
+    expect(0 >>> 4).toBe(0);
+    expect(0 >>> 5).toBe(0);
+
+    expect(1 >>> 0).toBe(1);
+    expect(1 >>> 1).toBe(0);
+    expect(1 >>> 2).toBe(0);
+    expect(1 >>> 3).toBe(0);
+    expect(1 >>> 4).toBe(0);
+    expect(1 >>> 5).toBe(0);
+
+    expect(5 >>> 0).toBe(5);
+    expect(5 >>> 1).toBe(2);
+    expect(5 >>> 2).toBe(1);
+    expect(5 >>> 3).toBe(0);
+    expect(5 >>> 4).toBe(0);
+    expect(5 >>> 5).toBe(0);
+
+    expect(42 >>> 0).toBe(42);
+    expect(42 >>> 1).toBe(21);
+    expect(42 >>> 2).toBe(10);
+    expect(42 >>> 3).toBe(5);
+    expect(42 >>> 4).toBe(2);
+    expect(42 >>> 5).toBe(1);
+});
+
+test("numeric shifting with negative lhs values", () => {
+    expect(-1 >>> 0).toBe(4294967295);
+    expect(-1 >>> 1).toBe(2147483647);
+    expect(-1 >>> 2).toBe(1073741823);
+    expect(-1 >>> 3).toBe(536870911);
+    expect(-1 >>> 4).toBe(268435455);
+    expect(-1 >>> 5).toBe(134217727);
+
+    expect(-5 >>> 0).toBe(4294967291);
+    expect(-5 >>> 1).toBe(2147483645);
+    expect(-5 >>> 2).toBe(1073741822);
+    expect(-5 >>> 3).toBe(536870911);
+    expect(-5 >>> 4).toBe(268435455);
+    expect(-5 >>> 5).toBe(134217727);
+});
+
+test("shifting with non-numeric values", () => {
+    let x = -67;
+    let y = 4;
+
+    expect("-42" >>> 3).toBe(536870906);
+    expect(x >>> y).toBe(268435451);
+    expect(x >>> [[[[5]]]]).toBe(134217725);
+    expect(undefined >>> y).toBe(0);
+    expect("a" >>> "b").toBe(0);
+    expect(null >>> null).toBe(0);
+    expect(undefined >>> undefined).toBe(0);
+    expect(NaN >>> NaN).toBe(0);
+    expect(6 >>> NaN).toBe(6);
+    expect(Infinity >>> Infinity).toBe(0);
+    expect(-Infinity >>> Infinity).toBe(0);
+});

Userland/Libraries/LibJS/Tests/operators/binary-bitwise-xor.js

@@ -0,0 +1,60 @@
+test("basic numeric xor", () => {
+    expect(0 ^ 0).toBe(0);
+    expect(0 ^ 1).toBe(1);
+    expect(0 ^ 2).toBe(2);
+    expect(0 ^ 3).toBe(3);
+    expect(0 ^ 4).toBe(4);
+    expect(0 ^ 5).toBe(5);
+
+    expect(1 ^ 0).toBe(1);
+    expect(1 ^ 1).toBe(0);
+    expect(1 ^ 2).toBe(3);
+    expect(1 ^ 3).toBe(2);
+    expect(1 ^ 4).toBe(5);
+    expect(1 ^ 5).toBe(4);
+
+    expect(2 ^ 0).toBe(2);
+    expect(2 ^ 1).toBe(3);
+    expect(2 ^ 2).toBe(0);
+    expect(2 ^ 3).toBe(1);
+    expect(2 ^ 4).toBe(6);
+    expect(2 ^ 5).toBe(7);
+
+    expect(3 ^ 0).toBe(3);
+    expect(3 ^ 1).toBe(2);
+    expect(3 ^ 2).toBe(1);
+    expect(3 ^ 3).toBe(0);
+    expect(3 ^ 4).toBe(7);
+    expect(3 ^ 5).toBe(6);
+
+    expect(4 ^ 0).toBe(4);
+    expect(4 ^ 1).toBe(5);
+    expect(4 ^ 2).toBe(6);
+    expect(4 ^ 3).toBe(7);
+    expect(4 ^ 4).toBe(0);
+    expect(4 ^ 5).toBe(1);
+
+    expect(5 ^ 0).toBe(5);
+    expect(5 ^ 1).toBe(4);
+    expect(5 ^ 2).toBe(7);
+    expect(5 ^ 3).toBe(6);
+    expect(5 ^ 4).toBe(1);
+    expect(5 ^ 5).toBe(0);
+});
+
+test("xor with non-numeric values", () => {
+    let x = 3;
+    let y = 7;
+
+    expect("42" ^ 6).toBe(44);
+    expect(x ^ y).toBe(4);
+    expect(x ^ [[[[12]]]]).toBe(15);
+    expect(undefined ^ y).toBe(7);
+    expect("a" ^ "b").toBe(0);
+    expect(null ^ null).toBe(0);
+    expect(undefined ^ undefined).toBe(0);
+    expect(NaN ^ NaN).toBe(0);
+    expect(NaN ^ 6).toBe(6);
+    expect(Infinity ^ Infinity).toBe(0);
+    expect(-Infinity ^ Infinity).toBe(0);
+});

Userland/Libraries/LibJS/Tests/operators/binary-relational.js

@@ -0,0 +1,729 @@
+test("basic functionality", () => {
+    const vals = [
+        1,
+        2,
+        1.23,
+        2.34567,
+        1n,
+        2n,
+        [],
+        [1],
+        [2],
+        [1, 2],
+        "foo",
+        "fooo",
+        "🔥",
+        "❤️",
+        "bar",
+        {},
+        { a: 1 },
+        { a: 2 },
+        { b: 1 },
+        true,
+        false,
+        undefined,
+        null,
+        NaN,
+        +Infinity,
+        -Infinity,
+    ];
+
+    // Each row contains: xIndex, yIndex, (x < y), (x > y), (x <= y), (x >= y)
+    // where x = vals[xIndex], y = vals[yIndex]
+    // Table can be generated using a mature engine and the following code:
+    // for (var xIndex = 0; xIndex < vals.length; ++xIndex) {
+    //     for (var yIndex = 0; yIndex < vals.length; ++yIndex) {
+    //         var x = vals[xIndex];
+    //         var y = vals[yIndex];
+    //         console.log(`[${xIndex}, ${yIndex}, ${x < y}, ${x > y}, ${x <= y}, ${x >= y}]`);
+    //     }
+    // }
+    const table = [
+        [0, 0, false, false, true, true],
+        [0, 1, true, false, true, false],
+        [0, 2, true, false, true, false],
+        [0, 3, true, false, true, false],
+        [0, 4, false, false, true, true],
+        [0, 5, true, false, true, false],
+        [0, 6, false, true, false, true],
+        [0, 7, false, false, true, true],
+        [0, 8, true, false, true, false],
+        [0, 9, false, false, false, false],
+        [0, 10, false, false, false, false],
+        [0, 11, false, false, false, false],
+        [0, 12, false, false, false, false],
+        [0, 13, false, false, false, false],
+        [0, 14, false, false, false, false],
+        [0, 15, false, false, false, false],
+        [0, 16, false, false, false, false],
+        [0, 17, false, false, false, false],
+        [0, 18, false, false, false, false],
+        [0, 19, false, false, true, true],
+        [0, 20, false, true, false, true],
+        [0, 21, false, false, false, false],
+        [0, 22, false, true, false, true],
+        [0, 23, false, false, false, false],
+        [0, 24, true, false, true, false],
+        [0, 25, false, true, false, true],
+        [1, 0, false, true, false, true],
+        [1, 1, false, false, true, true],
+        [1, 2, false, true, false, true],
+        [1, 3, true, false, true, false],
+        [1, 4, false, true, false, true],
+        [1, 5, false, false, true, true],
+        [1, 6, false, true, false, true],
+        [1, 7, false, true, false, true],
+        [1, 8, false, false, true, true],
+        [1, 9, false, false, false, false],
+        [1, 10, false, false, false, false],
+        [1, 11, false, false, false, false],
+        [1, 12, false, false, false, false],
+        [1, 13, false, false, false, false],
+        [1, 14, false, false, false, false],
+        [1, 15, false, false, false, false],
+        [1, 16, false, false, false, false],
+        [1, 17, false, false, false, false],
+        [1, 18, false, false, false, false],
+        [1, 19, false, true, false, true],
+        [1, 20, false, true, false, true],
+        [1, 21, false, false, false, false],
+        [1, 22, false, true, false, true],
+        [1, 23, false, false, false, false],
+        [1, 24, true, false, true, false],
+        [1, 25, false, true, false, true],
+        [2, 0, false, true, false, true],
+        [2, 1, true, false, true, false],
+        [2, 2, false, false, true, true],
+        [2, 3, true, false, true, false],
+        [2, 4, false, true, false, true],
+        [2, 5, true, false, true, false],
+        [2, 6, false, true, false, true],
+        [2, 7, false, true, false, true],
+        [2, 8, true, false, true, false],
+        [2, 9, false, false, false, false],
+        [2, 10, false, false, false, false],
+        [2, 11, false, false, false, false],
+        [2, 12, false, false, false, false],
+        [2, 13, false, false, false, false],
+        [2, 14, false, false, false, false],
+        [2, 15, false, false, false, false],
+        [2, 16, false, false, false, false],
+        [2, 17, false, false, false, false],
+        [2, 18, false, false, false, false],
+        [2, 19, false, true, false, true],
+        [2, 20, false, true, false, true],
+        [2, 21, false, false, false, false],
+        [2, 22, false, true, false, true],
+        [2, 23, false, false, false, false],
+        [2, 24, true, false, true, false],
+        [2, 25, false, true, false, true],
+        [3, 0, false, true, false, true],
+        [3, 1, false, true, false, true],
+        [3, 2, false, true, false, true],
+        [3, 3, false, false, true, true],
+        [3, 4, false, true, false, true],
+        [3, 5, false, true, false, true],
+        [3, 6, false, true, false, true],
+        [3, 7, false, true, false, true],
+        [3, 8, false, true, false, true],
+        [3, 9, false, false, false, false],
+        [3, 10, false, false, false, false],
+        [3, 11, false, false, false, false],
+        [3, 12, false, false, false, false],
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+        [21, 22, false, false, false, false],
+        [21, 23, false, false, false, false],
+        [21, 24, false, false, false, false],
+        [21, 25, false, false, false, false],
+        [22, 0, true, false, true, false],
+        [22, 1, true, false, true, false],
+        [22, 2, true, false, true, false],
+        [22, 3, true, false, true, false],
+        [22, 4, true, false, true, false],
+        [22, 5, true, false, true, false],
+        [22, 6, false, false, true, true],
+        [22, 7, true, false, true, false],
+        [22, 8, true, false, true, false],
+        [22, 9, false, false, false, false],
+        [22, 10, false, false, false, false],
+        [22, 11, false, false, false, false],
+        [22, 12, false, false, false, false],
+        [22, 13, false, false, false, false],
+        [22, 14, false, false, false, false],
+        [22, 15, false, false, false, false],
+        [22, 16, false, false, false, false],
+        [22, 17, false, false, false, false],
+        [22, 18, false, false, false, false],
+        [22, 19, true, false, true, false],
+        [22, 20, false, false, true, true],
+        [22, 21, false, false, false, false],
+        [22, 22, false, false, true, true],
+        [22, 23, false, false, false, false],
+        [22, 24, true, false, true, false],
+        [22, 25, false, true, false, true],
+        [23, 0, false, false, false, false],
+        [23, 1, false, false, false, false],
+        [23, 2, false, false, false, false],
+        [23, 3, false, false, false, false],
+        [23, 4, false, false, false, false],
+        [23, 5, false, false, false, false],
+        [23, 6, false, false, false, false],
+        [23, 7, false, false, false, false],
+        [23, 8, false, false, false, false],
+        [23, 9, false, false, false, false],
+        [23, 10, false, false, false, false],
+        [23, 11, false, false, false, false],
+        [23, 12, false, false, false, false],
+        [23, 13, false, false, false, false],
+        [23, 14, false, false, false, false],
+        [23, 15, false, false, false, false],
+        [23, 16, false, false, false, false],
+        [23, 17, false, false, false, false],
+        [23, 18, false, false, false, false],
+        [23, 19, false, false, false, false],
+        [23, 20, false, false, false, false],
+        [23, 21, false, false, false, false],
+        [23, 22, false, false, false, false],
+        [23, 23, false, false, false, false],
+        [23, 24, false, false, false, false],
+        [23, 25, false, false, false, false],
+        [24, 0, false, true, false, true],
+        [24, 1, false, true, false, true],
+        [24, 2, false, true, false, true],
+        [24, 3, false, true, false, true],
+        [24, 4, false, true, false, true],
+        [24, 5, false, true, false, true],
+        [24, 6, false, true, false, true],
+        [24, 7, false, true, false, true],
+        [24, 8, false, true, false, true],
+        [24, 9, false, false, false, false],
+        [24, 10, false, false, false, false],
+        [24, 11, false, false, false, false],
+        [24, 12, false, false, false, false],
+        [24, 13, false, false, false, false],
+        [24, 14, false, false, false, false],
+        [24, 15, false, false, false, false],
+        [24, 16, false, false, false, false],
+        [24, 17, false, false, false, false],
+        [24, 18, false, false, false, false],
+        [24, 19, false, true, false, true],
+        [24, 20, false, true, false, true],
+        [24, 21, false, false, false, false],
+        [24, 22, false, true, false, true],
+        [24, 23, false, false, false, false],
+        [24, 24, false, false, true, true],
+        [24, 25, false, true, false, true],
+        [25, 0, true, false, true, false],
+        [25, 1, true, false, true, false],
+        [25, 2, true, false, true, false],
+        [25, 3, true, false, true, false],
+        [25, 4, true, false, true, false],
+        [25, 5, true, false, true, false],
+        [25, 6, true, false, true, false],
+        [25, 7, true, false, true, false],
+        [25, 8, true, false, true, false],
+        [25, 9, false, false, false, false],
+        [25, 10, false, false, false, false],
+        [25, 11, false, false, false, false],
+        [25, 12, false, false, false, false],
+        [25, 13, false, false, false, false],
+        [25, 14, false, false, false, false],
+        [25, 15, false, false, false, false],
+        [25, 16, false, false, false, false],
+        [25, 17, false, false, false, false],
+        [25, 18, false, false, false, false],
+        [25, 19, true, false, true, false],
+        [25, 20, true, false, true, false],
+        [25, 21, false, false, false, false],
+        [25, 22, true, false, true, false],
+        [25, 23, false, false, false, false],
+        [25, 24, true, false, true, false],
+        [25, 25, false, false, true, true],
+    ];
+
+    for (let test of table) {
+        let x = vals[test[0]];
+        let y = vals[test[1]];
+
+        expect(x < y).toBe(test[2]);
+        expect(x > y).toBe(test[3]);
+        expect(x <= y).toBe(test[4]);
+        expect(x >= y).toBe(test[5]);
+    }
+});

Userland/Libraries/LibJS/Tests/operators/bitwise-not.js

@@ -0,0 +1,23 @@
+test("basic functionality", () => {
+    expect(~0).toBe(-1);
+    expect(~1).toBe(-2);
+    expect(~2).toBe(-3);
+    expect(~3).toBe(-4);
+    expect(~4).toBe(-5);
+    expect(~5).toBe(-6);
+    expect(~-1).toBe(0);
+    expect(~42).toBe(-43);
+    expect(~9999).toBe(-10000);
+});
+
+test("non-numeric values", () => {
+    expect(~"42").toBe(-43);
+    expect(~"foo").toBe(-1);
+    expect(~[]).toBe(-1);
+    expect(~{}).toBe(-1);
+    expect(~undefined).toBe(-1);
+    expect(~null).toBe(-1);
+    expect(~NaN).toBe(-1);
+    expect(~Infinity).toBe(-1);
+    expect(~-Infinity).toBe(-1);
+});

Userland/Libraries/LibJS/Tests/operators/comma-operator.js

@@ -0,0 +1,24 @@
+test("inside parenthesis", () => {
+    expect((1, 2, 3)).toBe(3);
+    expect((1, 2 + 3, 4)).toBe(4);
+});
+
+test("with post-increment operator", () => {
+    let foo = 0;
+    foo = (foo++, foo);
+    expect(foo).toBe(1);
+});
+
+test("with assignment operator", () => {
+    var a, b, c;
+    expect(((a = b = 3), (c = 4))).toBe(4);
+    expect(a).toBe(3);
+    expect(b).toBe(3);
+    expect(c).toBe(4);
+
+    var x, y, z;
+    expect((x = ((y = 5), (z = 6)))).toBe(6);
+    expect(x).toBe(6);
+    expect(y).toBe(5);
+    expect(z).toBe(6);
+});

Userland/Libraries/LibJS/Tests/operators/delete-basic.js

@@ -0,0 +1,61 @@
+test("deleting object properties", () => {
+    const o = {};
+    o.x = 1;
+    o.y = 2;
+    o.z = 3;
+    expect(Object.getOwnPropertyNames(o)).toHaveLength(3);
+
+    expect(delete o.x).toBeTrue();
+    expect(o.hasOwnProperty("x")).toBeFalse();
+    expect(o.hasOwnProperty("y")).toBeTrue();
+    expect(o.hasOwnProperty("z")).toBeTrue();
+    expect(Object.getOwnPropertyNames(o)).toHaveLength(2);
+
+    expect(delete o.y).toBeTrue();
+    expect(o.hasOwnProperty("x")).toBeFalse();
+    expect(o.hasOwnProperty("y")).toBeFalse();
+    expect(o.hasOwnProperty("z")).toBeTrue();
+    expect(Object.getOwnPropertyNames(o)).toHaveLength(1);
+
+    expect(delete o.z).toBeTrue();
+    expect(o.hasOwnProperty("x")).toBeFalse();
+    expect(o.hasOwnProperty("y")).toBeFalse();
+    expect(o.hasOwnProperty("z")).toBeFalse();
+    expect(Object.getOwnPropertyNames(o)).toHaveLength(0);
+});
+
+test("deleting array indices", () => {
+    const a = [3, 5, 7];
+
+    expect(Object.getOwnPropertyNames(a)).toHaveLength(4);
+
+    expect(delete a[0]).toBeTrue();
+    expect(a.hasOwnProperty(0)).toBeFalse();
+    expect(a.hasOwnProperty(1)).toBeTrue();
+    expect(a.hasOwnProperty(2)).toBeTrue();
+    expect(Object.getOwnPropertyNames(a)).toHaveLength(3);
+
+    expect(delete a[1]).toBeTrue();
+    expect(a.hasOwnProperty(0)).toBeFalse();
+    expect(a.hasOwnProperty(1)).toBeFalse();
+    expect(a.hasOwnProperty(2)).toBeTrue();
+    expect(Object.getOwnPropertyNames(a)).toHaveLength(2);
+
+    expect(delete a[2]).toBeTrue();
+    expect(a.hasOwnProperty(0)).toBeFalse();
+    expect(a.hasOwnProperty(1)).toBeFalse();
+    expect(a.hasOwnProperty(2)).toBeFalse();
+    expect(Object.getOwnPropertyNames(a)).toHaveLength(1);
+
+    expect(delete a["42"]).toBeTrue();
+    expect(Object.getOwnPropertyNames(a)).toHaveLength(1);
+});
+
+test("deleting non-configurable property", () => {
+    const q = {};
+    Object.defineProperty(q, "foo", { value: 1, writable: false, enumerable: false });
+    expect(q.foo).toBe(1);
+
+    expect(delete q.foo).toBeFalse();
+    expect(q.hasOwnProperty("foo")).toBeTrue();
+});

Userland/Libraries/LibJS/Tests/operators/delete-global-variable.js

@@ -0,0 +1,9 @@
+a = 1;
+
+test("basic functionality", () => {
+    expect(delete a).toBeTrue();
+
+    expect(() => {
+        a;
+    }).toThrowWithMessage(ReferenceError, "'a' is not defined");
+});

Userland/Libraries/LibJS/Tests/operators/delete-globalThis-property-crash.js

@@ -0,0 +1,8 @@
+a = 1;
+
+test("basic functionality", () => {
+    expect(delete globalThis.a).toBeTrue();
+    expect(() => {
+        a = 2;
+    }).not.toThrow();
+});

Userland/Libraries/LibJS/Tests/operators/in-operator-basic.js

@@ -0,0 +1,32 @@
+test("in operator with objects", () => {
+    const o = { foo: "bar", bar: undefined };
+    expect("" in o).toBeFalse();
+    expect("foo" in o).toBeTrue();
+    expect("bar" in o).toBeTrue();
+    expect("baz" in o).toBeFalse();
+    expect("toString" in o).toBeTrue();
+});
+
+test("in operator with arrays", () => {
+    const a = ["hello", "friends"];
+    expect(0 in a).toBeTrue();
+    expect(1 in a).toBeTrue();
+    expect(2 in a).toBeFalse();
+    expect("0" in a).toBeTrue();
+    expect("hello" in a).toBeFalse();
+    expect("friends" in a).toBeFalse();
+    expect("length" in a).toBeTrue();
+});
+
+test("in operator with string object", () => {
+    const s = new String("foo");
+    expect("length" in s).toBeTrue();
+});
+
+test("error when used with primitives", () => {
+    ["foo", 123, null, undefined].forEach(value => {
+        expect(() => {
+            "prop" in value;
+        }).toThrowWithMessage(TypeError, "'in' operator must be used on an object");
+    });
+});

Userland/Libraries/LibJS/Tests/operators/instanceof-basic.js

@@ -0,0 +1,36 @@
+test("basic functionality", () => {
+    function Foo() {
+        this.x = 123;
+    }
+
+    const foo = new Foo();
+    expect(foo instanceof Foo).toBeTrue();
+});
+
+test("derived ES5 classes", () => {
+    function Base() {
+        this.is_base = true;
+    }
+
+    function Derived() {
+        this.is_derived = true;
+    }
+
+    Object.setPrototypeOf(Derived.prototype, Base.prototype);
+
+    const d = new Derived();
+    expect(d instanceof Derived).toBeTrue();
+    expect(d instanceof Base).toBeTrue();
+});
+
+test("issue #3930, instanceof on arrow function", () => {
+    function f() {}
+    const a = () => {};
+
+    expect(() => {
+        f instanceof a;
+    }).toThrow(TypeError);
+    expect(() => {
+        a instanceof a;
+    }).toThrow(TypeError);
+});

Userland/Libraries/LibJS/Tests/operators/logical-and.js

@@ -0,0 +1,50 @@
+test("booleans", () => {
+    expect(true && true).toBeTrue();
+    expect(false && false).toBeFalse();
+    expect(true && false).toBeFalse();
+    expect(false && true).toBeFalse();
+});
+
+test("strings", () => {
+    expect("" && "").toBe("");
+    expect("" && false).toBe("");
+    expect("" && true).toBe("");
+    expect(false && "").toBeFalse();
+    expect(true && "").toBe("");
+    expect("foo" && "bar").toBe("bar");
+    expect("foo" && false).toBeFalse();
+    expect("foo" && true).toBeTrue();
+    expect(false && "bar").toBeFalse();
+    expect(true && "bar").toBe("bar");
+});
+
+test("numbers", () => {
+    expect(false && 1 === 2).toBeFalse();
+    expect(true && 1 === 2).toBeFalse();
+    expect(0 && false).toBe(0);
+    expect(0 && true).toBe(0);
+    expect(42 && false).toBeFalse();
+    expect(42 && true).toBeTrue();
+    expect(false && 0).toBeFalse();
+    expect(true && 0).toBe(0);
+    expect(false && 42).toBeFalse();
+    expect(true && 42).toBe(42);
+});
+
+test("objects", () => {
+    expect([] && false).toBeFalse();
+    expect([] && true).toBeTrue();
+    expect(false && []).toBeFalse();
+    expect(true && []).toHaveLength(0);
+});
+
+test("null & undefined", () => {
+    expect(null && false).toBeNull();
+    expect(null && true).toBeNull();
+    expect(false && null).toBeFalse();
+    expect(true && null).toBeNull();
+    expect(undefined && false).toBeUndefined();
+    expect(undefined && true).toBeUndefined();
+    expect(false && undefined).toBeFalse();
+    expect(true && undefined).toBeUndefined();
+});

Userland/Libraries/LibJS/Tests/operators/logical-expressions-short-circuit.js

@@ -0,0 +1,13 @@
+test("basic functionality", () => {
+    let foo = 1;
+    false && (foo = 2);
+    expect(foo).toBe(1);
+
+    foo = 1;
+    true || (foo = 2);
+    expect(foo).toBe(1);
+
+    foo = 1;
+    true ?? (foo = 2);
+    expect(foo).toBe(1);
+});

Userland/Libraries/LibJS/Tests/operators/logical-nullish-coalescing.js

@@ -0,0 +1,50 @@
+test("booleans", () => {
+    expect(true ?? true).toBeTrue();
+    expect(false ?? false).toBeFalse();
+    expect(true ?? false).toBeTrue();
+    expect(false ?? true).toBeFalse();
+});
+
+test("strings", () => {
+    expect("" ?? "").toBe("");
+    expect("" ?? false).toBe("");
+    expect("" ?? true).toBe("");
+    expect(false ?? "").toBeFalse();
+    expect(true ?? "").toBeTrue();
+    expect("foo" ?? "bar").toBe("foo");
+    expect("foo" ?? false).toBe("foo");
+    expect("foo" ?? true).toBe("foo");
+    expect(false ?? "bar").toBeFalse();
+    expect(true ?? "bar").toBeTrue();
+});
+
+test("numbers", () => {
+    expect(false ?? 1 === 2).toBeFalse();
+    expect(true ?? 1 === 2).toBeTrue();
+    expect(0 ?? false).toBe(0);
+    expect(0 ?? true).toBe(0);
+    expect(42 ?? false).toBe(42);
+    expect(42 ?? true).toBe(42);
+    expect(false ?? 0).toBeFalse();
+    expect(true ?? 0).toBeTrue();
+    expect(false ?? 42).toBeFalse();
+    expect(true ?? 42).toBeTrue();
+});
+
+test("objects", () => {
+    expect([] ?? false).toHaveLength(0);
+    expect([] ?? true).toHaveLength(0);
+    expect(false ?? []).toBeFalse();
+    expect(true ?? []).toBeTrue();
+});
+
+test("null & undefined", () => {
+    expect(null ?? false).toBeFalse();
+    expect(null ?? true).toBeTrue();
+    expect(false ?? null).toBeFalse();
+    expect(true ?? null).toBeTrue();
+    expect(undefined ?? false).toBeFalse();
+    expect(undefined ?? true).toBeTrue();
+    expect(false ?? undefined).toBeFalse();
+    expect(true ?? undefined).toBeTrue();
+});

Userland/Libraries/LibJS/Tests/operators/logical-or.js

@@ -0,0 +1,50 @@
+test("booleans", () => {
+    expect(true || true).toBeTrue();
+    expect(false || false).toBeFalse();
+    expect(true || false).toBeTrue();
+    expect(false || true).toBeTrue();
+});
+
+test("strings", () => {
+    expect("" || "").toBe("");
+    expect("" || false).toBeFalse();
+    expect("" || true).toBeTrue();
+    expect(false || "").toBe("");
+    expect(true || "").toBeTrue();
+    expect("foo" || "bar").toBe("foo");
+    expect("foo" || false).toBe("foo");
+    expect("foo" || true).toBe("foo");
+    expect(false || "bar").toBe("bar");
+    expect(true || "bar").toBeTrue();
+});
+
+test("numbers", () => {
+    expect(false || 1 === 2).toBeFalse();
+    expect(true || 1 === 2).toBeTrue();
+    expect(0 || false).toBeFalse();
+    expect(0 || true).toBeTrue();
+    expect(42 || false).toBe(42);
+    expect(42 || true).toBe(42);
+    expect(false || 0).toBe(0);
+    expect(true || 0).toBeTrue();
+    expect(false || 42).toBe(42);
+    expect(true || 42).toBeTrue();
+});
+
+test("objects", () => {
+    expect([] || false).toHaveLength(0);
+    expect([] || true).toHaveLength(0);
+    expect(false || []).toHaveLength(0);
+    expect(true || []).toBeTrue();
+});
+
+test("null & undefined", () => {
+    expect(null || false).toBeFalse();
+    expect(null || true).toBeTrue();
+    expect(false || null).toBeNull();
+    expect(true || null).toBeTrue();
+    expect(undefined || false).toBeFalse();
+    expect(undefined || true).toBeTrue();
+    expect(false || undefined).toBeUndefined();
+    expect(true || undefined).toBeTrue();
+});

Userland/Libraries/LibJS/Tests/operators/modulo-basic.js

@@ -0,0 +1,16 @@
+test("basic functionality", () => {
+    expect(10 % 3).toBe(1);
+    expect(10.5 % 2.5).toBe(0.5);
+    expect(-0.99 % 0.99).toBe(-0);
+
+    // Examples from MDN:
+    // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Arithmetic_Operators
+    expect(12 % 5).toBe(2);
+    expect(-1 % 2).toBe(-1);
+    expect(1 % -2).toBe(1);
+    expect(1 % 2).toBe(1);
+    expect(2 % 3).toBe(2);
+    expect(-4 % 2).toBe(-0);
+    expect(5.5 % 2).toBe(1.5);
+    expect(NaN % 2).toBeNaN();
+});

Userland/Libraries/LibJS/Tests/operators/ternary-basic.js

@@ -0,0 +1,20 @@
+test("basic functionality", () => {
+    const x = 1;
+
+    expect(x === 1 ? true : false).toBeTrue();
+    expect(x ? x : 0).toBe(x);
+    expect(1 < 2 ? true : false).toBeTrue();
+    expect(0 ? 1 : 1 ? 10 : 20).toBe(10);
+    expect(0 ? (1 ? 1 : 10) : 20).toBe(20);
+});
+
+test("object values", () => {
+    const o = {};
+    o.f = true;
+    expect(o.f ? true : false).toBeTrue();
+    expect(1 ? o.f : null).toBeTrue();
+});
+
+test("issue #4409, '?.' followed by decimal digit", () => {
+    expect("return false?.1:.2").toEvalTo(0.2);
+});

Userland/Libraries/LibJS/Tests/operators/typeof-basic.js

@@ -0,0 +1,27 @@
+test("basic functionality", () => {
+    expect(typeof "foo").toBe("string");
+    expect(typeof (1 + 2)).toBe("number");
+    expect(typeof {}).toBe("object");
+    expect(typeof null).toBe("object");
+    expect(typeof undefined).toBe("undefined");
+    expect(typeof 1n).toBe("bigint");
+    expect(typeof Symbol()).toBe("symbol");
+    expect(typeof function () {}).toBe("function");
+
+    var iExist = 1;
+    expect(typeof iExist).toBe("number");
+    expect(typeof iDontExist).toBe("undefined");
+});
+
+test("typeof calls property getter", () => {
+    var calls = 0;
+    Object.defineProperty(globalThis, "foo", {
+        get() {
+            calls++;
+            return 10;
+        },
+    });
+
+    expect(typeof foo).toBe("number");
+    expect(calls).toBe(1);
+});

Userland/Libraries/LibJS/Tests/operators/void-basic.js

@@ -0,0 +1,14 @@
+test("basic functionality", () => {
+    expect(void "").toBeUndefined();
+    expect(void "foo").toBeUndefined();
+    expect(void 1).toBeUndefined();
+    expect(void 42).toBeUndefined();
+    expect(void true).toBeUndefined();
+    expect(void false).toBeUndefined();
+    expect(void null).toBeUndefined();
+    expect(void undefined).toBeUndefined();
+    expect(void function () {}).toBeUndefined();
+    expect(void (() => {})).toBeUndefined();
+    expect(void (() => "hello friends")()).toBeUndefined();
+    expect((() => void "hello friends")()).toBeUndefined();
+});