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How to compare variables to undefined, if I don’t know whether they exist? [duplicate]
...s a string, and doesn't generate an error if the variable doesn't exist at all.
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How do I expire a PHP session after 30 minutes?
...ms with filesystems where atime tracking is not available.
So it additionally might occur that a session data file is deleted while the session itself is still considered as valid because the session data was not updated recently.
And second:
session.cookie_lifetime
session.cookie_lifetime ...
Flask-SQLalchemy update a row's information
...e many objects to be updated.
If you want to give add_user permission to all the admins,
rows_changed = User.query.filter_by(role='admin').update(dict(permission='add_user'))
db.session.commit()
Notice that filter_by takes keyword arguments (use only one =) as opposed to filter which takes an e...
Is there any performance reason to declare method parameters final in Java?
...
I have seen Sun's compiler emit marginally shorter bytecode when the only difference between the two methods has been the "finality" of local variables. Micro-optimizations are a real thing, and compilers do actually make them. What really matters, of course, is ...
Casting vs using the 'as' keyword in the CLR
...d within the if body.) That's slightly annoying in some cases, so if you really care about introducing the smallest number of variables possible in every scope, you might still want to use is followed by a cast.
I don't think any of the answers so far (at the time of starting this answer!) have r...
Check if checkbox is checked with jQuery
...here is more than one checkbox with that class name. The is(':checked') really only works on one element.
– John Boker
Apr 17 '13 at 12:59
5
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Cannot set boolean values in LocalStorage?
...ber or a boolean, the operands are converted to numbers if possible - I totally didn't realize that. I thought if one were a string, the other was cast to a string. Cheers (+1).
– Andy E
Jul 16 '10 at 9:01
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Why is not in HTML 5 Tag list while is?
Shouldn't both be removed? Or does it mean we should use <small> ? Why is <big> removed but <small> is not? What is the problem with <big> which does not apply to <small> ?
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vs vs for inline and block code snippets
... Problem with <pre> is it modifies whitespace processing as well: all spaces are preserved, and wrapping is switched off. Unless there's a way to switch this off?
– Steve Bennett
Jan 8 '11 at 23:55
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With CSS, use “…” for overflowed block of multi-lines
... @Ovilia note that Jim's solution also includes a jQuery plugin called jquery.autoellipsis.js, you'll have to download an include that separately
– Jeff
Jun 3 '11 at 17:47
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