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How to choose an AES encryption mode (CBC ECB CTR OCB CFB)?
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ECB should not be used if encrypting more than one block of data with the same key.
CBC, OFB and CFB are similar, however OFB/CFB is better because you only need encryption and not decryption, which can save code space.
CTR is used if you want good parallelization (ie. sp...
Using jQuery to replace one tag with another
...is a jsperf version which does not break the page: jsperf.com/substituting-one-tag-for-another-with-jquery/2 and you see the speed difference is not that huge anymore. Your solution is slower because you perform two DOM manipulations per element: unwrap removes the parent and adds the children to th...
Integer.toString(int i) vs String.valueOf(int i)
... of doing the same thing. It may be a historical reason (can't remember if one came before the other).
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Setting an object to null vs Dispose()
...isposal from garbage collection. They are completely separate things, with one point in common which I'll come to in a minute.
Dispose, garbage collection and finalization
When you write a using statement, it's simply syntactic sugar for a try/finally block so that Dispose is called even if the c...
In a PHP project, what patterns exist to store, access and organize helper objects? [closed]
....html
http://googletesting.blogspot.com/2008/08/where-have-all-singletons-gone.html
Alternatives
a service provider
http://java.sun.com/blueprints/corej2eepatterns/Patterns/ServiceLocator.html
dependency injection
http://en.wikipedia.org/wiki/Dependency_injection
and a php explanation:
http:/...
using data-* attribute with thymeleaf
... allow you to set an attribute twice in a tag, so you can't have more than one th:attr in the same element.
Note: If you want more that one attribute, separate the different attributes by comma:
<div th:attr="data-id=${element.getId()},data-name=${element.getName()}">
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Remove all classes that begin with a certain string
...ant to be able to clear all classes with a given prefix and then add a new one. If I want to remove all of the classes that begin with "bg", how do I do that? Something like this, but that actually works:
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Database cluster and load balancing
...e servers so the load is as evenly distributed as possible. It is usually done at the application layer (or with a connection pool). The only direct relation between replication and load balancing is that you need some replication to be able to load balance, else you'd have a single server.
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Polymorphism in C++
...at when the type of data you're processing has a .size() member you'll use one function, otherwise another function that doesn't need .size() (but presumably suffers in some way - e.g. using the slower strlen() or not printing as useful a message in the log). You can also specify ad-hoc behaviours ...
How do I make a textbox that only accepts numbers?
...xtbox control that I want to only accept integer values. In the past I've done this kind of validation by overloading the KeyPress event and just removing characters which didn't fit the specification. I've looked at the MaskedTextBox control but I'd like a more general solution that could work with...