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Best way to test if a generic type is a string? (C#)
I have a generic class that should allow any type, primitive or otherwise. The only problem with this is using default(T) . When you call default on a value type or a string, it initializes it to a reasonable value (such as empty string). When you call default(T) on an object, it returns null. Fo...
SVG图像加载扩展 - 第三方扩展集合 · App Inventor 2 中文网
...px 15px rgba(0, 0, 0, .1); display: flex; flex-direction: column; align-items: center; } .feedback-pop:hover, .feedback-pop .feedback-img:hover { color: #3773f5 } .feedback-pop .feedback-img { display: inline-block; width: 24px; height: 24px; margin-bottom: 4px; background: url(/static/imag...
Default string initialization: NULL or Empty? [closed]
...nk when I see something like this in our code base:
string msg = Validate(item);
if (msg != null)
{
DisplayErrorMessage(msg);
return;
}
I know that Validate would never return String.Empty, because we write better code than that.
Of course, the rest of the world doesn't work like this. Wh...
Why does the expression 0 < 0 == 0 return False in Python?
...esult_code == 0], before this I had never seen a boolean used to select an item in a list/tuple.
– Andrew Clark
May 20 '11 at 16:24
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What is an idempotent operation?
...ed more than once with the same input parameters. For example, removing an item from a set can be considered an idempotent operation on the set.
In mathematics, an idempotent operation is one where f(f(x)) = f(x). For example, the abs() function is idempotent because abs(abs(x)) = abs(x) for all x....
How does View Controller Containment work in iOS 5?
...call willMoveToParentViewController prior to addChildViewController if the item you are moving is a custom class with overridden addChildViewController (unless your override calls it internally)
– bunkerdive
Mar 10 '17 at 17:08
...
Dynamically set local variable [duplicate]
...
You can use a local dictionary and put all the dynamic bindings as items into the dictionary. Then knowing the name of such a "dynamic variable" you can use the name as the key to get its value.
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Examples of Algorithms which has O(1), O(n log n) and O(log n) complexities
...r Algorithms based on Linear functionality
Calculating Fibonacci Numbers - Best Method
The basic premise here is NOT using the complete data, and reducing the problem size with every iteration
O(n log n) time
The factor of 'log n' is introduced by bringing into consideration Divide and Conquer....
Iterating over a numpy array
....shape[0]) for j in range(X.shape[1]) for k in range(X.shape[2])])
1 loop, best of 3: 376 ms per loop
%timeit list(np.ndenumerate(X))
1 loop, best of 3: 570 ms per loop
If you are worried about the performance you could optimise a bit further by looking at the implementation of ndenumerate, which...
When and why should I use fragments in Android applications? [duplicate]
... a webView that takes up the other half - so that when you click on a list item in fragment A it passes an intent to the webView in fragment B, and suddenly you see what you just clicked without the app switching activities - then you could use a fragment. That's just an example I came up with off ...