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Best way to define private methods for a class in Objective-C
... you can create a category with an empty name (i.e. @interface MyClass ()) called Class Extension. What's unique about a class extension is that the method implementations must go in the same @implementation MyClass as the public methods. So I structure my classes like this:
In the .h file:
@inter...
How do you create a random string that's suitable for a session ID in PostgreSQL?
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random() gets called length times (like in many of the other solutions). Is there a more efficient way to choose from 62 characters each time? How does this perform compared to md5()?
– ma11hew28
Feb ...
There is already an open DataReader associated with this Command which must be closed first
...check for these repeated data loads can help speed up your data processing calls by reducing round trips.
– Chris Moschini
Dec 15 '12 at 18:11
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How to autosize a textarea using Prototype?
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Facebook does it, when you write on people's walls, but only resizes vertically.
Horizontal resize strikes me as being a mess, due to word-wrap, long lines, and so on, but vertical resize seems to be pretty safe and nice.
None of the Facebook-using-newbies I know have ever mentioned anything abou...
How to redirect to a 404 in Rails?
...you want to show a 404 page, create a render_404 method (or not_found as I called it) in ApplicationController like this:
def not_found
raise ActionController::RoutingError.new('Not Found')
end
Rails also handles AbstractController::ActionNotFound, and ActiveRecord::RecordNotFound the same way...
How to handle button clicks using the XML onClick within Fragments
... I've been doing during conversions is simply adding a click listener that calls the old event handler.
for instance:
final Button loginButton = (Button) view.findViewById(R.id.loginButton);
loginButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(final View v) ...
Elegant ways to support equivalence (“equality”) in Python classes
...r class A(B):.
For classic-style classes, a comparison operation always calls the method of the first operand, while for new-style classes, it always calls the method of the subclass operand, regardless of the order of the operands.
So here, if Number is a classic-style class:
n1 == n3 calls ...
What part of Hindley-Milner do you not understand?
...atement saying "I can prove ... in a context Γ. These statements are also called type judgements.
Another thing to keep in mind: in math, just like ML and Scala, x : σ means that x has type σ. You can read it just like Haskell's x :: σ.
What each rule means
So, knowing this, the first expres...
Find() vs. Where().FirstOrDefault()
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Just to complement: There is no need to call Where and First or FirstOrDefault: either First or FirstOrDefault allows you to specify a search predicate, making the Where call unnecessary
– Robson Rocha
Jul 6 '12 at 23:45
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jQuery : eq() vs get()
...stand what the get() function does, but I thought it odd that I couldn't call a function on the returned on the returned element in the same line.
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