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What techniques can be used to define a class in JavaScript, and what are their trade-offs?
... object-orientation, some of them are:
class-based OO (first introduced by Smalltalk)
prototype-based OO (first introduced by Self)
multimethod-based OO (first introduced by CommonLoops, I think)
predicate-based OO (no idea)
And probably others I don't know about.
JavaScript implements prototy...
CSRF Token necessary when using Stateless(= Sessionless) Authentication?
... even after the user closes the browser window. The data is not accessible by other websites, because every site gets its own storage.
sessionStorage: Also an in browser data store. The difference is: The data gets deleted when the user closes the browser window. But it is still useful, if your weba...
Understanding repr( ) function in Python
... quote. Of course it does, otherwise it wouldn't be a valid string literal by Python rules. That's precisely what you asked for by calling repr.
Also note that the eval(repr(x)) == x analogy isn't meant literal. It's an approximation and holds true for most (all?) built-in types, but the main thing...
How do I change the number of open files limit in Linux? [closed]
...nforced limits
hard limits mark the maximum value which cannot be exceeded by setting a soft limit
Soft limits could be set by any user while hard limits are changeable only by root.
Limits are a property of a process. They are inherited when a child process is created so system-wide limits should...
What's the algorithm to calculate aspect ratio?
...eed to do is find the greatest common divisor (GCD) and divide both values by that. The GCD is the highest number that evenly divides both numbers. So the GCD for 6 and 10 is 2, the GCD for 44 and 99 is 11.
For example, a 1024x768 monitor has a GCD of 256. When you divide both values by that you ge...
How do you represent a graph in Haskell?
... I've just resorted to additional indirection, as you're suggesting; often by using a map from ids to the actual elements, and having elements contain references to the ids instead of to other elements. The main thing I didn't like about doing that (aside from the obvious inefficiency) is that it fe...
What are MVP and MVC and what is the difference?
...sentation in WebForms. The reason is that the View is always created first by the ASP.NET runtime. You can find out more about both variants.
Two primary variations
Passive View: The View is as dumb as possible and contains almost zero logic. A Presenter is a middle man that talks to the View and th...
Create a folder if it doesn't already exist
...0777 is already the default mode for directories and may still be modified by the current umask.
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How does bash tab completion work?
... parts to the autocompletion:
The readline library, as already mentioned by fixje, manages the command line editing, and calls back to bash when tab is pressed, to enable completion. Bash then gives (see next point) a list of possible completions, and readline inserts as much characters as are ide...
Callback to a Fragment from a DialogFragment
...tion();
Fragment prev = getActivity().getFragmentManager().findFragmentByTag("dialog");
if (prev != null) {
ft.remove(prev);
}
ft.addToBackStack(null);
switch (type) {
case DIALOG_FRAGMENT:
DialogFragment dialogFrag = MyDialogFragment.newInstance(12...