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Mutex example / tutorial? [closed]
...world: (a color coded version on my blog too)
A lot of people run to a lone phone booth (they don't have mobile phones) to talk to their loved ones. The first person to catch the door-handle of the booth, is the one who is allowed to use the phone. He has to keep holding on to the handle of the d...
Why do I need an IoC container as opposed to straightforward DI code? [closed]
... Whatever this is (IoC, DynamicProxy, AOP or black magic) can someone link me to a concrete article/specific documentation in framework that provides more details for achieving this?
– fostandy
May 19 '10 at 6:38
...
How do I pass a string into subprocess.Popen (using the stdin argument)?
...e Popen object with
stdin=PIPE. Similarly, to get anything
other than None in the result tuple,
you need to give stdout=PIPE and/or
stderr=PIPE too.
Replacing os.popen*
pipe = os.popen(cmd, 'w', bufsize)
# ==>
pipe = Popen(cmd, shell=True, bufsize=bufsize, stdin=PIPE).s...
valueOf() vs. toString() in Javascript
...if the hint is Number, then valueOf will be used first. Note that if only one is present, or it returns a non-primitive, it will usually call the other as the second choice.
The + operator always provides the hint Number, even if the first operand is a string value. Even though it asks x for its ...
range() for floats
...
I don't know a built-in function, but writing one like this shouldn't be too complicated.
def frange(x, y, jump):
while x < y:
yield x
x += jump
As the comments mention, this could produce unpredictable results like:
>>> list(frange(0, 100, 0....
Factory Pattern. When to use factory methods?
...r.
So, to me the factory pattern is like a hiring agency. You've got someone that will need a variable number of workers. This person may know some info they need in the people they hire, but that's it.
So, when they need a new employee, they call the hiring agency and tell them what they need. ...
How do I pass a variable by reference?
... the method, the outer scope will know nothing about it, and after you're done, the outer reference will still point at the original object.
If you pass an immutable object to a method, you still can't rebind the outer reference, and you can't even mutate the object.
To make it even more clear, l...
How to create a date and time picker in Android? [closed]
...
Am I the only one baffled at the fact that Google doesn't even support one of the most widely used controls in any business applications out there?
– l46kok
Jan 5 '15 at 3:13
...
What are database normal forms and can you give examples? [closed]
...is the most basic of normal forms - each cell in a table must contain only one piece of information, and there can be no duplicate rows.
2NF and 3NF are all about being dependent on the primary key. Recall that a primary key can be made up of multiple columns. As Chris said in his response:
The da...
Where does Scala look for implicits?
...alue that can be passed "automatically", so to speak, or a conversion from one type to another that is made automatically.
Implicit Conversion
Speaking very briefly about the latter type, if one calls a method m on an object o of a class C, and that class does not support method m, then Scala will...