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What is Normalisation (or Normalization)?
...nly do de-normalisation when really needed
P.S. also check this article: http://en.wikipedia.org/wiki/Database_normalization to read more on the subject and about so-called normal forms
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What is the equivalent of the C# 'var' keyword in Java?
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If you add Lombok to your project you can use its val keyword.
http://projectlombok.org/features/val.html
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How to detect if multiple keys are pressed at once using JavaScript?
...eyup event to keep track of when the keys are released.
See this example: http://jsfiddle.net/vor0nwe/mkHsU/
(Update: I’m reproducing the code here, in case jsfiddle.net bails:)
The HTML:
<ul id="log">
<li>List of keys:</li>
</ul>
...and the Javascript (using jQuer...
Performant Entity Serialization: BSON vs MessagePack (vs JSON)
...-checking API, MessagePack supports IDL. (specification is available from: http://wiki.msgpack.org/display/MSGPACK/Design+of+IDL)
Protocol Buffers and Thrift require IDL (don't support dynamic-typing) and provide more mature IDL implementation.
MessagePack has streaming API (Ruby, Python, Java, C++...
How to sort in-place using the merge sort algorithm?
..., this paper describes a couple of variants of in-place merge sort (PDF):
http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.22.5514&rep=rep1&type=pdf
In-place sorting with fewer moves
Jyrki Katajainen, Tomi A. Pasanen
It is shown that an array of n
elements can be sorted usi...
surface plots in matplotlib
...y.meshgrid() is a simple way to get 2d x,y mesh out of 1d x and y values.
http://matplotlib.sourceforge.net/mpl_examples/mplot3d/surface3d_demo.py
here's pythonic way to convert your 3-tuples to 3 1d arrays.
data = [(1,2,3), (10,20,30), (11, 22, 33), (110, 220, 330)]
X,Y,Z = zip(*data)
In [7]: X
...
Can C++ code be valid in both C++03 and C++11 but do different things?
...t-shift in C++03. This is more likely to break existing code though: (from http://gustedt.wordpress.com/2013/12/15/a-disimprovement-observed-from-the-outside-right-angle-brackets/)
template< unsigned len > unsigned int fun(unsigned int x);
typedef unsigned int (*fun_t)(unsigned int);
template&...
How to write iOS app purely in C
... arbitrary code before program startup,
// for more information read here: http://stackoverflow.com/questions/2053029
__attribute__((constructor))
static void initAppDel()
{
// This is objc-runtime gibberish at best. We are creating a class with the
// name "AppDelegate" that is a subclass ...
Java Stanford NLP: Part of Speech labels?
... of tags for the Penn Treebank (posted here for the sake of completness):
http://www.surdeanu.info/mihai/teaching/ista555-fall13/readings/PennTreebankConstituents.html
It also includes tags for clause and phrase levels.
Clause Level
- S
- SBAR
- SBARQ
- SINV
- SQ
Phrase Level
- ADJP
- ADVP
- ...
Secure hash and salt for PHP passwords
... address as suggested in first answer.
More explanation is available at- http://www.pivotalsecurity.com/blog/password-hashing-salt-should-it-be-random/
Recently I had a discussion whether password hashes salted with random
bits are more secure than the one salted with guessable or known
sa...