"MRAB" <pyt...@mrabarnett.plus.com> wrote in message news:52568b30.8040...@mrabarnett.plus.com... > On 10/10/2013 09:23, Frank Millman wrote: >> >> "Steven D'Aprano" <st...@pearwood.info> wrote in message >> news:52562ee3$0$2931$c3e8da3$76491...@news.astraweb.com... >>> Just came across this little Javascript gem: >>> >>> ",,," == Array((null,'cool',false,NaN,4)); >>> >>> => evaluates as true >>> >>> http://wtfjs.com/2011/02/11/all-your-commas-are-belong-to-Array >>> >>> I swear, I am never going to complain about Python again. >>> >> >> I am sure you know this, but for the record, Javascript has two equality >> operators, '==' and '==='. >> >> The double form attempts to coerce the left and right sides to the same >> type, the triple form does not. >> > Re "==", this page: > > http://php.net/manual/en/language.operators.comparison.php > > states: > > """If you compare a number with a string or the *comparison involves > numerical strings*, then each string is converted to a number and the > comparison performed numerically.""" (emphasis added) > > So they get coerced to numbers if they _look_ like numbers! >
I just tested Steven's example. ",,," == Array((null,'cool',false,NaN,4)) evaluates to true ",,," === Array((null,'cool',false,NaN,4)) evaluates to false I did look at the article that Steven linked to, but it made my eyes glaze, so don't ask me to explain it. I am prepared to use up a few brain cells trying to improve my own programming, but not trying to understand someone else's 'wtf' moments! [1] Frank [1] Unless I have to maintain it, of course. I have been there before, and I have some dark memories! -- https://mail.python.org/mailman/listinfo/python-list
