v8/test/mjsunit/compare-nan.js

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var a = [NaN, -1, 0, 1, 1.2, -7.9, true, false, 'foo', '0', 'NaN' ];
for (var i in a) {
  var x = a[i];
  assertFalse(NaN == x, "NaN == " + x);
  assertFalse(NaN === x, "NaN === " + x);
  assertFalse(NaN < x, "NaN < " + x);
  assertFalse(NaN > x, "NaN > " + x);
  assertFalse(NaN <= x, "NaN <= " + x);
  assertFalse(NaN >= x, "NaN >= " + x);

  assertFalse(x == NaN, "" + x + " == NaN");
  assertFalse(x === NaN, "" + x + " === NaN");
  assertFalse(x < NaN, "" + x + " < NaN");
  assertFalse(x > NaN, "" + x + " > NaN");
  assertFalse(x <= NaN, "" + x + " <= NaN");
  assertFalse(x >= NaN, "" + x + " >= NaN");
}

var b = ["NaN", "-1", "0", "1", "1.2", "-7.9", "true", "false", "'foo'", "'0'",
         "'NaN'" ];
for (var i in b) {
  var x = b[i];
  var program =
      "assertFalse(NaN == " + x + ", 'NaN == ' + " + x + ");\n" +
      "assertFalse(NaN === " + x + ", 'NaN === ' + " + x + ");\n" +
      "assertFalse(NaN < " + x + ", 'NaN < ' + " + x + ");\n" +
      "assertFalse(NaN > " + x + ", 'NaN > ' + " + x + ");\n" +
      "assertFalse(NaN <= " + x + ", 'NaN <= ' + " + x + ");\n" +
      "assertFalse(NaN >= " + x + ", 'NaN >= ' + " + x + ");\n" +

      "assertFalse(" + x + " == NaN, '' + " + x + " + ' == NaN');\n" +
      "assertFalse(" + x + " === NaN, '' + " + x + " + ' === NaN');\n" +
      "assertFalse(" + x + " < NaN, '' + " + x + " + ' < NaN');\n" +
      "assertFalse(" + x + " > NaN, '' + " + x + " + ' > NaN');\n" +
      "assertFalse(" + x + " <= NaN, '' + " + x + " + ' <= NaN');\n" +
      "assertFalse(" + x + " >= NaN, '' + " + x + " + ' >= NaN');\n";
  eval(program);
}