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Async Procedures 拓展：异步任务拓展，异步处理耗时任务 - App Inventor 2...
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the a is the 1st item in the list
the b is the 2nd item in the list
NOW THE FUN PART!Call a Procedure Async Using this block
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These 2 Blo...
Android. Fragment getActivity() sometimes returns null
...
The best to get rid of this is to keep activity reference when onAttach is called and use the activity reference wherever needed, for e.g.
@Override
public void onAttach(Context context) {
super.onAttach(context);
mConte...
How to set ViewBag properties for all Views without using a base class for Controllers?
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The best way is using the ActionFilterAttribute. I'll show you how to use it in .Net Core and .Net Framework.
.Net Core 2.1 & 3.1
public class ViewBagActionFilter : ActionFilterAttribute
{
public override void OnResultExe...
How to get a index value from foreach loop in jstl
...e index c:forEach varStatus properties
<c:forEach var="categoryName" items="${categoriesList}" varStatus="loop">
<li><a onclick="getCategoryIndex(${loop.index})" href="#">${categoryName}</a></li>
</c:forEach>
...
What are the typical reasons Javascript developed on Firefox fails on IE? [closed]
...ribute in forms (depending which is defined first in the document) so it's best not to have different elements which have the same name and id. This dates back to the days when id wasn't a w3c standard. document.all (a proprietary IE-specific property) is significantly faster than document.getElemen...
Using global variables in a function
...l variables with the same notation used to refer to its functions, modname.itemname.
A specific use of global-in-a-module is described here - How do I share global variables across modules?, and for completeness the contents are shared here:
The canonical way to share information across module...
Iterate over object attributes in python
...ect):
def __iter__(self):
for attr, value in self.__dict__.iteritems():
yield attr, value
Your class:
>>> class YourClass(IterMixin): pass
...
>>> yc = YourClass()
>>> yc.one = range(15)
>>> yc.two = 'test'
>>> dict(yc)
{'one': ...
Advantages of std::for_each over for loop
...) {
my_monkey->eat(*i);
}
But new range based for is probably the best:
for (auto& b : bananas)
my_monkey.eat(b);
But the for_each could be useful, especially if you have several functions to call in order but need to run each method for all objects before next... but maybe that'...
Get Image Height and Width as integer values?
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PHP's getimagesize() returns an array of data. The first two items in the array are the two items you're interested in: the width and height. To get these, you would simply request the first two indexes in the returned array:
var $imagedata = getimagesize("someimage.jpg");
print "Ima...
vector vs. list in STL
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Situations where you want to insert a lot of items into anywhere but the end of a sequence repeatedly.
Check out the complexity guarantees for each different type of container:
What are the complexity guarantees of the standard containers?
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