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Fundamental difference between Hashing and Encryption algorithms
...tions
They provide a mapping between an arbitrary length input, and a (usually) fixed length (or smaller length) output. It can be anything from a simple crc32, to a full blown cryptographic hash function such as MD5 or SHA1/2/256/512. The point is that there's a one-way mapping going on. It's a...
Regular expression to match DNS hostname or IP Address?
...o be escaped with \.
ValidHostnameRegex is valid as per RFC 1123. Originally, RFC 952 specified that hostname segments could not start with a digit.
http://en.wikipedia.org/wiki/Hostname
The original specification of
hostnames in RFC
952,
mandated that labels could not start
with a d...
How dangerous is it to access an array out of bounds?
... repeatedly accessing a single memory location in a tight loop could literally cause that chunk of memory to melt. Other possibilities include destroying a CRT display, and moving the read/write head of a disk drive with the harmonic frequency of the drive cabinet, causing it to walk across a table...
Encapsulation vs Abstraction?
...actions. At its most abstract level there is no implementation details at all and perhaps very few commonalities, which are added as the abstraction decreases.
As an example, at the top might be an interface with a single method, then the next level, provides several abstract classes, which may or...
How do I scroll to an element within an overflowed Div?
... a good way to scroll to item #10, and then item #20? I know the height of all the items.
7 Answers
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IISExpress returns a 503 error from remote machines
...swered Mar 27 '11 at 21:07
vikomallvikomall
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What is the difference between const and readonly in C#?
...time of a definition for a const VS readonly values can be computed dynamically but need to be assigned before the constructor exits.. after that it is frozen.
'const's are implicitly static. You use a ClassName.ConstantName notation to access them.
There is a subtle difference. Consider a class d...
Difference between window.location.href=window.location.href and window.location.reload()
...
Also note that location.reload() will also force reload all static content (much like a ctrl+f5 style hard refresh) whereas setting location.href back to href (or pathname or URL) does not, which could be a significant (and unnecessary) difference in load time on some pages.
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Timer & TimerTask versus Thread + sleep in Java
...threading issues (such as avoiding deadlocks etc.). And of course it is usually better to use well-tested standard code instead of some homemade solution.
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Signal handling with multiple threads in Linux
...ote that this is specific to SIGUSR1, which IIRC doesn't interrupt system calls. If you tried this with SIGINT for example, it could interrupt a stream read, and when you went to return to reading, the stream may return an error that it was interrupted.
– Alan
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