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How can I check if a string is null or empty in PowerShell?
Is there a built-in IsNullOrEmpty -like function in order to check if a string is null or empty, in PowerShell?
11 Answers...
Insert code into the page context using a content script
.... Resources must be listed in the web_accessible_resources manifest key in order to be loaded by pages outside the extension.
Method 2: Inject embedded code
This method is useful when you want to quickly run a small piece of code. (See also: How to disable facebook hotkeys with Chrome extension?).
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Post-increment and pre-increment within a 'for' loop produce same output [duplicate]
... the old value of i after incrementing, I think ++i may be shorter (on the order of 1-2 instructions).
– danben
Feb 5 '11 at 0:18
26
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扩展App Inventor：具有多点触控和手势检测功能 · App Inventor 2 中文网
...his event, so it detects the rotation even when we do not intend it to. In order to solve this problem, we add a buffer when we detect $MotionEvent.ACTION_MOVE$, so that we only fire “rotation” when the positions of two fingers change above some threshold.
Figure 6. Block designed for Rotatio...
Why can't I have abstract static methods in C#?
...also for something like class Car {public static virtual Car Build(PurchaseOrder PO);}, where every class deriving from Car would have to define a method which could build an instance given a purchase order.
– supercat
Jun 16 '13 at 20:23
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Getting image dimensions without reading the entire file
...)
{
int maxMagicBytesLength = imageFormatDecoders.Keys.OrderByDescending(x => x.Length).First().Length;
byte[] magicBytes = new byte[maxMagicBytesLength];
for (int i = 0; i < maxMagicBytesLength; i += 1)
{
magicBytes[i] ...
Interface Builder: What are the UIView's Layout iOS 6/7 Deltas for?
... you're working with. If you're editing for iOS 6, the deltas there are in order to transform the element correctly for iOS 7 (the reverse of the example above).
In order to view the different styles, you can change the way Interface Builder presents it based on the OS it would be running on. This ...
What is the difference between graph search and tree search?
...ts attached to edges). This basically holds whenever nodes are expanded in order of increasing cost, or when the cost is a nonzero positive constant. A common algorithm that implements this kind of select is uniform cost search, or if step costs are identical, BFS or IDDFS. IDDFS avoids BFS's aggres...
When & why to use delegates? [duplicate]
...f the benefits of compile time static binding. Invocation of a delegate is orders of magnitude faster than the reflection invoke alternative. Additionally if a function signature changes such that it no longer matches the delegate this results in a compile time error which you don't get with reflect...
How do I update a GitHub forked repository?
...rebased your branch onto upstream/master you may need to force the push in order to push it to your own forked repository on GitHub. You'd do that with:
git push -f origin master
You only need to use the -f the first time after you've rebased.
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