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How can I make a div stick to the top of the screen once it's been scrolled to?
...s been scrolled enough to contact its top boundary, becomes fixed in place and scrolls with the page.
21 Answers
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When should one use RxJava Observable and when simple Callback on Android?
...e getUserPhoto example:
RxJava:
api.getUserPhoto(photoId)
.observeOn(AndroidSchedulers.mainThread())
.subscribe(new Action1<Photo>() {
@Override
public void call(Photo photo) {
// do some stuff with your photo
}
});
Callback:...
What's the purpose of using braces (i.e. {}) for a single-line if or loop?
I'm reading some lecture notes of my C++ lecturer and he wrote the following:
23 Answers
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How can I install pip on Windows?
...
Python 2.7.9+ and 3.4+
Good news! Python 3.4 (released March 2014) and Python 2.7.9 (released December 2014) ship with Pip. This is the best feature of any Python release. It makes the community's wealth of libraries accessible to everyon...
“Could not find any information for class named ViewController”
...roject.
Steps:
In the project file explorer (left panel) find the class and right click -> Delete
Remove reference (do not move to trash as you will lose the class for good)
Right click on the folder that contained the class -> Add files to ...
Find the class you just deleted in the file sy...
CPU Privilege Rings: Why rings 1 and 2 aren't used?
...the modern protection model) only has a concept of privileged (ring 0,1,2) and unprivileged, the benefit to rings 1 and 2 were diminished greatly.
The intent by Intel in having rings 1 and 2 is for the OS to put device drivers at that level, so they are privileged, but somewhat separated from the r...
Git push requires username and password
...Clone or download", then clicking the "Use SSH" button above the URL field and updating the URL of your origin remote like this:
git remote set-url origin git@github.com:username/repo.git
This is documented at GitHub: Switching remote URLs from HTTPS to SSH.
...
Why is std::map implemented as a red-black tree?
...bly the two most common self balancing tree algorithms are Red-Black trees and AVL trees. To balance the tree after an insertion/update both algorithms use the notion of rotations where the nodes of the tree are rotated to perform the re-balancing.
While in both algorithms the insert/delete operat...
What is the difference between UTF-8 and ISO-8859-1?
What is the difference between UTF-8 and ISO-8859-1 ?
8 Answers
8
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Semaphore vs. Monitors - what's the difference?
What are the major differences between a Monitor and a Semaphore ?
6 Answers
6
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