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What is Weak Head Normal Form?
...es for an expression to be in WHNF:
A constructor: constructor expression_1 expression_2 ...
A built-in function with too few arguments, like (+) 2 or sqrt
A lambda-expression: \x -> expression
In other words, the head of the expression (i.e. the outermost function application) cannot be eval...
Naming of ID columns in database tables
...
ID is a SQL Antipattern.
See http://www.amazon.com/s/ref=nb_sb_ss_i_1_5?url=search-alias%3Dstripbooks&field-keywords=sql+antipatterns&sprefix=sql+a
If you have many tables with ID as the id you are making reporting that much more difficult. It obscures meaning and makes comp...
How can I measure the speed of code written in PHP? [closed]
...ows things down), but use the possibility to send a parameter called XDEBUG_PROFILE as GET data, to activate profiling just for the page I need.
The profiling-related part of my php.ini looks like this :
xdebug.profiler_enable = 0 ; Profiling not activated by default
xdebug.profiler_en...
Time complexity of Sieve of Eratosthenes algorithm
...cause we need an array of n elements in any case?
– a_123
Mar 25 '16 at 21:35
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Reading a binary file with python
...ve something to unpack is pretty trivial:
import struct
data = open("from_fortran.bin", "rb").read()
(eight, N) = struct.unpack("@II", data)
This unpacks the first two fields, assuming they start at the very beginning of the file (no padding or extraneous data), and also assuming native byte-or...
Using ping in c#
... InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
Ping p = new Ping();
PingReply r;
string s;
s = textBox1.Text;
r = p.Send(s);
i...
How can I convert immutable.Map to mutable.Map in Scala?
...table.Map(1->"one",2->"Two")
val n = collection.mutable.Map(m.toSeq: _*)
This works because a Map can also be viewed as a sequence of Pairs.
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Phonegap Cordova installation Windows
...Data\Roaming\npm\cordova -> C:\Users\binaryuser\AppData\Roaming\npm\node_modules\cordova\bin\cordova
cordova@3.0.9 C:\Users\binaryuser\AppData\Roaming\npm\node_modules\cordova
├── ncallbacks@1.0.0
├── open@0.0.3
├── colors@0.6.2
├── semver@1.1.0
├── shelljs@0.1.2
├...
#include in .h or .c / .cpp?
...
True, but doesn't the #ifndef _CALLBACK_H_, on the top of it, prevent the compiler in processing it more than once?
– hytromo
Feb 8 '14 at 12:25
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Why can't I define a static method in a Java interface?
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While I understand the arguments, I agree with @Chris_Betti (even for non-generic types): it'd be nice that the code structure ensures that some classes implements a specific static API. Maybe it is possible using a different concept...
– Juh_
...