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!
'1' == 1 returns true
'1' === 1 returns false
The moment I discovered this, I changed all my operators from the double
form to the triple form. Now I no longer have surprises of this nature.
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