Created
July 6, 2010 05:49
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| Apparently JS has a tilde (~) operator. It's a unary operator that returns -(N + 1). So, using it and indexOf seems to give you a simple but unreadable test for substring detection. Since indexOf('stringthatisntthere') returns -1, the ~ operator turns that into -(-1 + 1) = -0 = 0, which is false. Otherwise, it'll always be true. |
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| var ua = "Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10_6_4; en-US) AppleWebKit/534.2 (KHTML, like Gecko) Chrome/6.0.453.1 Safari/534.2"; | |
| ~ua.indexOf("Firefox") // => false | |
| ~ua.indexOf("Chrome") // => true |
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