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Explanation of JSONB introduced by PostgreSQL
...ONB and it's already trending on hacker news . It would be great if someone could explain how it's different from Hstore and JSON previously present in PostgreSQL. What are its advantages and limitations and when should someone consider using it?
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What is the difference between a symbolic link and a hard link?
Recently I was asked this during a job interview. I was honest and said I knew how a symbolic link behaves and how to create one, but do not understand the use of a hard link and how it differs from a symbolic one.
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Unable to update the EntitySet - because it has a DefiningQuery and no element exis
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It usually happens because one of the following reasons:
Entity Set is mapped from Database view
A custom Database query
Database table doesn't have a primary key
After doing so, you may still need to update in the Entity Framework designer (or alt...
Which C++ idioms are deprecated in C++11?
...due to first-class support for rvalue references.
Safe bool: This was mentioned earlier. Explicit operators of C++11 obviate this very common C++03 idiom.
Shrink-to-fit: Many C++11 STL containers provide a shrink_to_fit() member function, which should eliminate the need swapping with a temporary.
Te...
Why is it impossible to build a compiler that can determine if a C++ function will change the value
...ven program will terminate. This is known as the halting problem, and it's one of those things that's not computable.
To be clear, you can write a compiler that can determine that a function does change the variable in some cases, but you can't write one that reliably tells you that the function wi...
AngularJS with Django - Conflicting template tags
...y both use {{ }} as their template tags. Is there an easy way to change one of the two to use some other custom templating tag?
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Why are static variables considered evil?
...t given a choice between two otherwise equally valid designs, the testable one is superior. Being testable certainly doesn't equate to being well designed, but I've rarely come across untestable good designs, and I think they're sufficiently rare that I have no problem in making testability a genera...
What is Java String interning?
...ist of names where 'john' appears 1000 times, by interning you ensure only one 'john' is actually allocated memory.
This can be useful to reduce memory requirements of your program. But be aware that the cache is maintained by JVM in permanent memory pool which is usually limited in size compared t...
Multiple arguments vs. options object
... had to look up the function to figure out what parameters it takes
If someone ever tries to strangle you while screaming "ARRRRRG!"
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Convert String[] to comma separated string in java
i have one String[]
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