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Instance variables vs. class variables in Python
I have Python classes, of which I need only one instance at runtime, so it would be sufficient to have the attributes only once per class and not per instance. If there would be more than one instance (which won't happen), all instance should have the same configuration. I wonder which of the follow...
How much faster is C++ than C#?
...as C++ code. However C++ code used to be significantly faster for a long time, and also today still is in many cases. This is mainly due to the more advanced JIT optimizations being complicated to implement, and the really cool ones are only arriving just now.
So C++ is faster, in many cases. But t...
How to avoid null checking in Java?
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This to me sounds like a reasonably common problem that junior to intermediate developers tend to face at some point: they either don't know or don't trust the contracts they are participating in and defensively overcheck for nulls. ...
How to remove/ignore :hover css style on touch devices
...a tablet triggers it on click/tap because then it might stick until the element loses focus. To be honest, I don't know why touch devices feel the need to trigger :hover in first place - but this is reality, so this problem is reality as well.
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What is recursion and when should I use it?
One of the topics that seems to come up regularly on mailing lists and online discussions is the merits (or lack thereof) of doing a Computer Science Degree. An argument that seems to come up time and again for the negative party is that they have been coding for some number of years and they have n...
How to paste yanked text into the Vim command line
...gister 1 goes to register 2, etc.),
" (default register, also known as unnamed register. This is where the " comes in Ctrl-R, "),
a to z for your own use (capitalized A to Z are for appending to corresponding registers).
_ (acts like /dev/null (Unix) or NUL (Windows), you can write to it but it's di...
How to prevent Browser cache for php site
...r.When ever i add new files css, js or images the browser is loading the same old js, css and image files stored in cache.
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How to filter SQL results in a has-many-through relation
... which is the fastest way to skin a cat?
The precise cat-skinning environment for this test:
PostgreSQL 9.0 on Debian Squeeze with decent RAM and settings.
6.000 students, 24.000 club memberships (data copied from a similar database with real life data.)
Slight diversion from the naming schema i...
Should I return a Collection or a Stream?
Suppose I have a method that returns a read-only view into a member list:
9 Answers
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How do I give text or an image a transparent background using CSS?
Is it possible, using CSS only, to make the background of an element semi-transparent but have the content (text & images) of the element opaque?
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