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Should a retrieval method return 'null' or throw an exception when it can't produce the return value
... In Java 8, returning Optional<T> (called Maybe<T>, etc. in other languages) is an option as well. This clearly indicates to the caller that returning nothing is a possibility, and won't compile if the caller hasn't handled that possibility, as opposed to null, which (in Java ...
When to use a Content Provider
...e access to a singleton instance (the ContentResolver) to perform queries, etc. Of course you could implement your own Loader to use for your SQLite database... of course you could implement access to a single database instance across the entire application... and of course a ContentProvider isn't r...
How do I import other TypeScript files?
...gt;
/// <reference path="components/someclass.ts"/>
class Foo { }
etc.
These paths are relative to the current file.
Your example:
/// <reference path="moo.ts"/>
class bar extends moo.foo
{
}
share
...
Android adding simple animations while setvisibility(view.Gone)
...l kinds of events. Like when the animation starts, when it ends or repeats etc. By using the abstract class AnimatorListenerAdapter you don't have to implement all callbacks of AnimatorListener at once but only those you need. This makes the code more readable. For example the following code fades o...
Can modules have properties the same way that objects can?
... in the module containing the class will not be "visible" during run time, etc...
– tutuDajuju
Nov 1 '16 at 9:41
...
How do I check if an integer is even or odd? [closed]
... is used for signed numbers -- 2's compliment, 1's compliment, grey-coded, etc. But modulus is always modulus
– Aaron
Oct 2 '08 at 9:07
9
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When to use NSInteger vs. int
... I would recommend using NSInteger/CGFloat when interacting with iOS API's etc if you are also building your app for arm64.
This is because you will likely get unexpected results when you use the float, long and int types.
EXAMPLE: FLOAT/DOUBLE vs CGFLOAT
As an example we take the UITableView dele...
Python in Xcode 4+?
...pe in "-l". This will tell bash to use your login environment (PYTHONPATH, etc..)
Do step #19 again.
Type in "-c '$(SOURCE_ROOT)/.py'"
Click "OK".
Start coding.
The nice thing about this way is it will use the same environment to develop in that you would use to run in outside of XCode (as setup...
'dragleave' of parent element fires when dragging over children elements
...ildren, e.g. hover to show buttons for additional actions, inline-editing, etc... However, none of that is necessary or in fact even desired during a drag.
In my case, I use something like this to turn pointer events off selectively for all child nodes of the parent container:
div.drag-target-pa...
Performance of Java matrix math libraries? [closed]
... not? For some purposes, eg when one is parallelizing using mpi or hadoop etc, the important time is actually the singlecore time, since the mpi/hadoop implementation takes care of parallelizing things. (At least, for me jblas was about 2.5 faster than jama, not 10 times faster than jama as you got...