comparisons.js

comparisons: {
    options = {
        comparisons: true,
    }
    input: {
        var obj1, obj2;
        var result1 = obj1 <= obj2;
        var result2 = obj1 <  obj2;
        var result3 = obj1 >= obj2;
        var result4 = obj1 >  obj2;
    }
    expect: {
        var obj1, obj2;
        var result1 = obj1 <= obj2;
        var result2 = obj1 <  obj2;
        var result3 = obj2 <= obj1;
        var result4 = obj2 <  obj1;
    }
}

unsafe_comps: {
    options = {
        comparisons: true,
        conditionals: true,
        unsafe_comps: true,
    }
    input: {
        var obj1, obj2;
        obj1 <= obj2 ? f1() : g1();
        obj1 <  obj2 ? f2() : g2();
        obj1 >= obj2 ? f3() : g3();
        obj1 >  obj2 ? f4() : g4();
    }
    expect: {
        var obj1, obj2;
        (obj2 <  obj1 ? g1 : f1)();
        (obj1 <  obj2 ? f2 : g2)();
        (obj1 <  obj2 ? g3 : f3)();
        (obj2 <  obj1 ? f4 : g4)();
    }
}

dont_change_in_or_instanceof_expressions: {
    input: {
        1 in 1;
        null in null;
        1 instanceof 1;
        null instanceof null;
    }
    expect: {
        1 in 1;
        null in null;
        1 instanceof 1;
        null instanceof null;
    }
}

self_comparison_1: {
    options = {
        comparisons: true,
    }
    input: {
        a === a;
        a !== b;
        b.c === a.c;
        b.c !== b.c;
    }
    expect: {
        a == a;
        a !== b;
        b.c === a.c;
        b.c != b.c;
    }
}

self_comparison_2: {
    options = {
        comparisons: true,
        reduce_funcs: true,
        reduce_vars: true,
        toplevel: true,
    }
    input: {
        function f() {}
        var o = {};
        console.log(f != f, o === o);
    }
    expect: {
        function f() {}
        var o = {};
        console.log(false, true);
    }
    expect_stdout: "false true"
}

self_comparison_3: {
    options = {
        comparisons: true,
    }
    input: {
        var a;
        function f() {
            var b = a;
            a = null;
            return b;
        }
        for (var i = 0; i < 2; i++)
            console.log(f() === f());
    }
    expect: {
        var a;
        function f() {
            var b = a;
            a = null;
            return b;
        }
        for (var i = 0; i < 2; i++)
            console.log(f() === f());
    }
    expect_stdout: [
        "false",
        "true",
    ]
}

self_comparison_4: {
    options = {
        booleans: true,
        comparisons: true,
        reduce_vars: true,
        toplevel: true,
        unused: true,
    }
    input: {
        var o = {};
        console.log(o == o, o != o);
        console.log(o === o, o !== o);
    }
    expect: {
        console.log(!0, !1);
        console.log(!0, !1);
    }
    expect_stdout: [
        "true false",
        "true false",
    ]
}

issue_2857_1: {
    options = {
        comparisons: true,
    }
    input: {
        function f1(a) {
            a === undefined || a === null;
            a === undefined || a !== null;
            a !== undefined || a === null;
            a !== undefined || a !== null;
            a === undefined && a === null;
            a === undefined && a !== null;
            a !== undefined && a === null;
            a !== undefined && a !== null;
        }
        function f2(a) {
            a === null || a === undefined;
            a === null || a !== undefined;
            a !== null || a === undefined;
            a !== null || a !== undefined;
            a === null && a === undefined;
            a === null && a !== undefined;
            a !== null && a === undefined;
            a !== null && a !== undefined;
        }
    }
    expect: {
        function f1(a) {
            null == a;
            void 0 === a || null !== a;
            void 0 !== a || null === a;
            void 0 !== a || null !== a;
            void 0 === a && null === a;
            void 0 === a && null !== a;
            void 0 !== a && null === a;
            null != a;
        }
        function f2(a) {
            null == a;
            null === a || void 0 !== a;
            null !== a || void 0 === a;
            null !== a || void 0 !== a;
            null === a && void 0 === a;
            null === a && void 0 !== a;
            null !== a && void 0 === a;
            null != a;
        }
    }
}

issue_2857_2: {
    options = {
        comparisons: true,
    }
    input: {
        function f(a, p) {
            a === undefined || a === null || p;
            a === undefined || a !== null || p;
            a !== undefined || a === null || p;
            a !== undefined || a !== null || p;
            a === undefined && a === null || p;
            a === undefined && a !== null || p;
            a !== undefined && a === null || p;
            a !== undefined && a !== null || p;
        }
    }
    expect: {
        function f(a, p) {
            null == a || p;
            void 0 === a || null !== a || p;
            void 0 !== a || null === a || p;
            void 0 !== a || null !== a || p;
            void 0 === a && null === a || p;
            void 0 === a && null !== a || p;
            void 0 !== a && null === a || p;
            null != a || p;
        }
    }
}

issue_2857_3: {
    options = {
        comparisons: true,
    }
    input: {
        function f(a, p) {
            a === undefined || a === null && p;
            a === undefined || a !== null && p;
            a !== undefined || a === null && p;
            a !== undefined || a !== null && p;
            a === undefined && a === null && p;
            a === undefined && a !== null && p;
            a !== undefined && a === null && p;
            a !== undefined && a !== null && p;
        }
    }
    expect: {
        function f(a, p) {
            void 0 === a || null === a && p;
            void 0 === a || null !== a && p;
            void 0 !== a || null === a && p;
            void 0 !== a || null !== a && p;
            void 0 === a && null === a && p;
            void 0 === a && null !== a && p;
            void 0 !== a && null === a && p;
            null != a && p;
        }
    }
}

issue_2857_4: {
    options = {
        comparisons: true,
    }
    input: {
        function f(a, p) {
            p || a === undefined || a === null;
            p || a === undefined || a !== null;
            p || a !== undefined || a === null;
            p || a !== undefined || a !== null;
            p || a === undefined && a === null;
            p || a === undefined && a !== null;
            p || a !== undefined && a === null;
            p || a !== undefined && a !== null;
        }
    }
    expect: {
        function f(a, p) {
            p || null == a;
            p || void 0 === a || null !== a;
            p || void 0 !== a || null === a;
            p || void 0 !== a || null !== a;
            p || void 0 === a && null === a;
            p || void 0 === a && null !== a;
            p || void 0 !== a && null === a;
            p || null != a;
        }
    }
}

issue_2857_5: {
    options = {
        comparisons: true,
    }
    input: {
        function f(a, p) {
            p && a === undefined || a === null;
            p && a === undefined || a !== null;
            p && a !== undefined || a === null;
            p && a !== undefined || a !== null;
            p && a === undefined && a === null;
            p && a === undefined && a !== null;
            p && a !== undefined && a === null;
            p && a !== undefined && a !== null;
        }
    }
    expect: {
        function f(a, p) {
            p && void 0 === a || null === a;
            p && void 0 === a || null !== a;
            p && void 0 !== a || null === a;
            p && void 0 !== a || null !== a;
            p && void 0 === a && null === a;
            p && void 0 === a && null !== a;
            p && void 0 !== a && null === a;
            p && null != a;
        }
    }
}

issue_2857_6: {
    options = {
        comparisons: true,
        pure_getters: "strict",
        reduce_vars: true,
    }
    input: {
        function f(a) {
            if (({}).b === undefined || {}.b === null)
                return a.b !== undefined && a.b !== null;
        }
        console.log(f({
            a: [ null ],
            get b() {
                return this.a.shift();
            }
        }));
    }
    expect: {
        function f(a) {
            if (null == {}.b)
                return void 0 !== a.b && null !== a.b;
        }
        console.log(f({
            a: [ null ],
            get b() {
                return this.a.shift();
            }
        }));
    }
    expect_stdout: "true"
}

is_boolean_unsafe: {
    options = {
        comparisons: true,
        unsafe: true,
    }
    input: {
        console.log(/foo/.test("bar") === [].isPrototypeOf({}));
    }
    expect: {
        console.log(/foo/.test("bar") == [].isPrototypeOf({}));
    }
    expect_stdout: "true"
}

is_number_unsafe: {
    options = {
        comparisons: true,
        unsafe: true,
    }
    input: {
        console.log(Math.acos(42) !== "foo".charCodeAt(4));
    }
    expect: {
        console.log(Math.acos(42) != "foo".charCodeAt(4));
    }
    expect_stdout: "true"
}

is_boolean_var: {
    options = {
        comparisons: true,
        reduce_vars: true,
    }
    input: {
        console.log(function(a, b) {
            for (var i = 0, c = !b; i < a.length; i++)
                if (!a[i] === c)
                    return i;
        }([ false, true ], 42));
    }
    expect: {
        console.log(function(a, b) {
            for (var i = 0, c = !b; i < a.length; i++)
                if (!a[i] == c)
                    return i;
        }([ false, true ], 42));
    }
    expect_stdout: "1"
}

is_defined: {
    options = {
        comparisons: true,
    }
    input: {
        console.log(function a() {
            return void 0 === a;
        }());
    }
    expect: {
        console.log(function a() {
            return a, false;
        }());
    }
    expect_stdout: "false"
    expect_warnings: [
        "WARN: Expression always defined [test/compress/comparisons.js:2,19]",
    ]
}

unsafe_indexOf: {
    options = {
        booleans: true,
        comparisons: true,
        unsafe: true,
    }
    input: {
        var a = Object.keys({ foo: 42 });
        if (a.indexOf("bar") < 0) console.log("PASS");
        if (0 > a.indexOf("bar")) console.log("PASS");
        if (a.indexOf("foo") >= 0) console.log("PASS");
        if (0 <= a.indexOf("foo")) console.log("PASS");
        if (a.indexOf("foo") > -1) console.log("PASS");
        if (-1 < a.indexOf("foo")) console.log("PASS");
        if (a.indexOf("bar") == -1) console.log("PASS");
        if (-1 == a.indexOf("bar")) console.log("PASS");
        if (a.indexOf("bar") === -1) console.log("PASS");
        if (-1 === a.indexOf("bar")) console.log("PASS");
        if (a.indexOf("foo") != -1) console.log("PASS");
        if (-1 != a.indexOf("foo")) console.log("PASS");
        if (a.indexOf("foo") !== -1) console.log("PASS");
        if (-1 !== a.indexOf("foo")) console.log("PASS");
    }
    expect: {
        var a = Object.keys({ foo: 42 });
        if (!~a.indexOf("bar")) console.log("PASS");
        if (!~a.indexOf("bar")) console.log("PASS");
        if (~a.indexOf("foo")) console.log("PASS");
        if (~a.indexOf("foo")) console.log("PASS");
        if (~a.indexOf("foo")) console.log("PASS");
        if (~a.indexOf("foo")) console.log("PASS");
        if (!~a.indexOf("bar")) console.log("PASS");
        if (!~a.indexOf("bar")) console.log("PASS");
        if (!~a.indexOf("bar")) console.log("PASS");
        if (!~a.indexOf("bar")) console.log("PASS");
        if (~a.indexOf("foo")) console.log("PASS");
        if (~a.indexOf("foo")) console.log("PASS");
        if (~a.indexOf("foo")) console.log("PASS");
        if (~a.indexOf("foo")) console.log("PASS");
    }
    expect_stdout: [
        "PASS",
        "PASS",
        "PASS",
        "PASS",
        "PASS",
        "PASS",
        "PASS",
        "PASS",
        "PASS",
        "PASS",
        "PASS",
        "PASS",
        "PASS",
        "PASS",
    ]
}

issue_3413: {
    options = {
        comparisons: true,
        evaluate: true,
        side_effects: true,
    }
    input: {
        var b;
        void 0 !== ("" < b || void 0) || console.log("PASS");
    }
    expect: {
        var b;
        void 0 === ("" < b || void 0) && console.log("PASS");
    }
    expect_stdout: "PASS"
}