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May 30, 2016 13:44
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| function exists(e) { | |
| return { | |
| [false]: false, | |
| [void 0]: true | |
| }[{ | |
| [void 0]: false, | |
| [{}]: false, | |
| [false]: false, | |
| [undefined]: false, | |
| [1 / 0]: false | |
| }[e]] | |
| } | |
| var a = '' | |
| if (exists[a]) { | |
| //is really not null | |
| } else { | |
| //is null | |
| } | |
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