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How is this fibonacci-function memoized?
...
You don't need memoize function for Haskell. Only empirative programming language need that functions. However, Haskel is functional lang and...
So, this is example of very fast Fibonacci algorithm:
fib = zipWith (+) (0:(1:fib)) (1:fib)
zipWith is function from standard Prelude:
zipWith :: (a...
Why should we NOT use sys.setdefaultencoding(“utf-8”) in a py script?
...requires PYTHONIOENCODING to fix the console encoding.
Example:
$ export LANG=en_GB.gibberish
$ python
>>> import sys
>>> sys.stdout.encoding
'ANSI_X3.4-1968'
>>> print u"\u20AC"
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
Unicode...
Why doesn't Java allow overriding of static methods?
...problem, but that it creates a trap for the unwary programmer, because the language does not behave as I think a reasonable person would expect.
Perhaps if I tried to write a compiler for an OOP language, I would quickly see why implementing it so that static functions can be overriden would be dif...
What does the Java assert keyword do, and when should it be used?
...to check public method parameters (docs.oracle.com/javase/1.4.2/docs/guide/lang/assert.html). That should throw an Exception instead of killing the program.
– SJuan76
Aug 25 '13 at 21:58
...
What does “Could not find or load main class” mean?
...l be different. It is liable to say something like this:
Caused by: java.lang.NoClassDefFoundError: <path> (wrong name: <name>)
because the FQN in the class file doesn't match what the class loader is expecting to find.
To give a concrete example, supposing that:
you want to run ...
Why do we use __init__ in Python classes?
...lly initialized with a new value:
import java.util.ArrayList;
import java.lang.String;
class SimpleTest
{
public ArrayList<String> attr = new ArrayList<String>();
}
class Main
{
public static void main(String [] args)
{
SimpleTest t1 = new SimpleTest();
Sim...
What is the scope of variables in JavaScript?
...(and accurate) explanation of scope and property resolution is in the comp.lang.javascript FAQ notes.
– RobG
Sep 10 '12 at 0:35
...
Virtual Memory Usage from Java under Linux, too much memory used
...try/linux_glibc_2_10_rhel_6_malloc_may_show_excessive_virtual_memory_usage?lang=en
This blog post says
resident memory has been known to creep in a manner similar to a
memory leak or memory fragmentation.
There is also an open JDK bug JDK-8193521 "glibc wastes memory with default configurat...
Is the Scala 2.8 collections library a case of “the longest suicide note in history”? [closed]
...his lets us implement most major functionality in libraries. In some other languages, sequences with something like map or collect would be built in, and nobody has to see all the hoops the compiler has to go through to make them work smoothly. In Scala, it's all in a library, and therefore out in t...
How to design a product table for many kinds of product where each product has many parameters
...ing those interactions and requirements on a proper level as a programming language of an application does.
In my opinion using a database in this way is like using a rock to hammer a nail. You can do it with a rock but aren't you suppose to use a hammer which is more precise and specifically desig...