testUndefinedBooleanCmp.js

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function testUndefinedBooleanCmp()

    var t = true, f = false, x = [];

    for (var i = 0; i < 10; ++i) {

        x[0] = t == undefined;

        x[1] = t != undefined;

        x[2] = t === undefined;

        x[3] = t !== undefined;

        x[4] = t < undefined;

        x[5] = t > undefined;

        x[6] = t <= undefined;

        x[7] = t >= undefined;

        x[8] = f == undefined;

        x[9] = f != undefined;

        x[10] = f === undefined;

        x[11] = f !== undefined;

        x[12] = f < undefined;

        x[13] = f > undefined;

        x[14] = f <= undefined;

        x[15] = f >= undefined;

    return x.join(",");

assertEq(testUndefinedBooleanCmp(), "false,true,false,true,false,false,false,false,false,true,false,true,false,false,false,false");