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Check whether number is even or odd
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@crush n % 2 == 0 semantically means Divide by 2 and check if the remainder is 0, which is much clearer than n & 1 == 0 which means Zero all the bits but leave the least significant bit unchanged and check if the result is 0. The improved clarity of the first is wo...
What is the difference between JavaScript and ECMAScript?
... answer says very little and basically points you to Wikipedia. The answer by Yang Li is much more detailed and useful. Also, whether one is the language/standard and other the dialect, or implementation etc is open to opinion, and not fact, from what I understand. Whereas this answer makes it appea...
Is it .yaml or .yml?
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So which am I supposed to use? The proper 4 letter extension suggested by the creator, or the 3 letter extension found in the wild west of the internet?
This question could be:
A request for advice; or
A natural expression of that particular emotion which is experienced, while one is observi...
window.onload vs
...event called DOMContentLoaded which fires earlier, but it is not supported by IE (at the time of writing this answer). I'd recommend using a javascript library which supports a cross browser DOMContentLoaded feature, or finding a well written function you can use. jQuery's $(document).ready(), is ...
Do subclasses inherit private fields?
...2):
Members of a class that are declared
private are not inherited by
subclasses of that class. Only members
of a class that are declared protected
or public are inherited by subclasses
declared in a package other than the
one in which the class is declared.
This addresses the ex...
Should I URL-encode POST data?
...general answer to your question is that it depends. And you get to decide by specifying what your "Content-Type" is in the HTTP headers.
A value of "application/x-www-form-urlencoded" means that your POST body will need to be URL encoded just like a GET parameter string. A value of "multipart/form...
Is file append atomic in UNIX?
... size of 'PIPE_BUF' is supposed to be atomic. That should be at least 512 bytes, though it could easily be larger (linux seems to have it set to 4096).
This assume that you're talking all fully POSIX-compliant components. For instance, this isn't true on NFS.
But assuming you write to a log file...
SQL DROP TABLE foreign key constraint
... still the same 'Could not drop object 'my_table' because it is referenced by a FOREIGN KEY constraint.
– FrenkyB
Nov 16 '15 at 13:00
7
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How do PHP sessions work? (not “how are they used?”)
...to the user when his session is created.
it is stored in a cookie (called, by default, PHPSESSID)
that cookie is sent by the browser to the server with each request
the server (PHP) uses that cookie, containing the session_id, to know which file corresponds to that user.
The data in the sessions f...
What is size_t in C?
I am getting confused with size_t in C. I know that it is returned by the sizeof operator. But what exactly is it? Is it a data type?
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