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How to create a protocol with methods that are optional?
...re is a @required keyword
to formally denote the semantics of
the default behavior. You can use
@optional and @required to partition
your protocol into sections as you see
fit. If you do not specify any
keyword, the default is @required.
@protocol MyProtocol
- (void)requiredMethod;
@...
How to initialize an array's length in JavaScript?
...alize the length? Theoretically there is no need for this. It can even result in confusing behavior, because all tests that use the length to find out whether an array is empty or not will report that the array is not empty.
Some tests show that setting the initial length of large arrays can be more...
How to do two-way filtering in AngularJS?
One of the interesting things AngularJS can do is apply a filter to a particular databinding expression, which is a convenient way to apply, for example, culture-specific currency or date formatting of a model's properties. It is also nice to have computed properties on the scope. The problem is tha...
git pull fails “unable to resolve reference” “unable to update local ref”
...e the local repository
git gc [--aggressive] [--auto] [--quiet] [--prune=<date> | --no-prune]
Runs a number of housekeeping tasks within the current repository, such as compressing file revisions
(to reduce disk space and increase performance) and removing unreachable objects w...
android: move a view on touch move (ACTION_MOVE)
...s View.OnTouchListener {
TextView _view;
ViewGroup _root;
private int _xDelta;
private int _yDelta;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
_root = (ViewGroup)findViewById(R.id.root);
_view = n...
How to disable all inside a form with jQuery?
...s all input, textarea, select and button elements.
If you only want the <input> elements:
$("#target input").prop("disabled", true);
share
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improve this answer
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f...
How does generic lambda work in C++14?
...mbda an instance of this type:
class /* unnamed */
{
public:
template<typename T>
T operator () (T a) const { return a; }
};
Paragraph 5.1.2/5 of the C++14 Standard Draft n3690 specifies how the call operator of the closure type of a given lambda expression is defined:
The closu...
Splitting a list into N parts of approximately equal length
... avg = len(seq) / float(num)
out = []
last = 0.0
while last < len(seq):
out.append(seq[int(last):int(last + avg)])
last += avg
return out
Testing:
>>> chunkIt(range(10), 3)
[[0, 1, 2], [3, 4, 5], [6, 7, 8, 9]]
>>> chunkIt(range(11), 3)
[[0, ...
How to pass an ArrayList to a varargs method parameter?
...{
for (String s : strs)
System.out.println(s);
}
...
List<String> strs = new ArrayList<String>();
strs.add("hello");
strs.add("wordld");
method(strs.toArray(new String[strs.size()]));
// ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
...
...
How to make the python interpreter correctly handle non-ASCII characters in string operations?
...
Python 2 uses ascii as the default encoding for source files, which means you must specify another encoding at the top of the file to use non-ascii unicode characters in literals. Python 3 uses utf-8 as the default encoding for source files, so this is less...