| undef(); // this line will generate a warning | |
| if (typeof undef) {} // this line won't because typeof accepts a reference | |
| // even when the base object of that reference is null | |
| if (typeof undef['attr' + 0]) { | |
| delete undef['attr' + 0]; | |
| } | |
| if (typeof undef.attr) { | |
| delete undef.attr; | |
| } | |
| var fn = function () { | |
| localUndef(); | |
| if (typeof localUndef) | |
| return; | |
| if (typeof localUndef['attr' + 0]) { | |
| delete localUndef['attr' + 0]; | |
| } | |
| if (typeof localUndef.attr) { | |
| delete localUndef.attr; | |
| } | |
| }; |