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26284votes
27answers
1.7mviews

Why is processing a sorted array faster than processing an unsorted array?

Here is a piece of C++ code that shows some very peculiar behavior. For some strange reason, sorting the data (before the timed region) miraculously makes the loop almost six times faster. #include &...
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  • 476k
24080votes
98answers
10.8mviews

How do I undo the most recent local commits in Git?

I accidentally committed the wrong files to Git but didn't push the commit to the server yet. How can I undo those commits from the local repository? The only way seems to be to copy the edits in some ...
19030votes
41answers
9.8mviews

How do I delete a Git branch locally and remotely?

I want to delete a branch both locally and remotely. Failed Attempts to Delete a Remote Branch $ git branch -d remotes/origin/bugfix error: branch 'remotes/origin/bugfix' not found. $ git branch -d ...
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13079votes
38answers
3.1mviews

What is the difference between 'git pull' and 'git fetch'?

What are the differences between git pull and git fetch?
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  • 265k
11912votes
47answers
2.9mviews

What does the "yield" keyword do?

What is the use of the yield keyword in Python? What does it do? For example, I'm trying to understand this code1: def _get_child_candidates(self, distance, min_dist, max_dist): if self._leftchild ...
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  • 135k
11099votes
37answers
3.4mviews

What is the correct JSON content type?

I've been messing around with JSON for some time, just pushing it out as text and it hasn't hurt anybody (that I know of), but I'd like to start doing things properly. I have seen so many purported &...
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  • 226k
10444votes
127answers
9.7mviews

How can I remove a specific item from an array?

I have an array of numbers and I'm using the .push() method to add elements to it. Is there a simple way to remove a specific element from an array? I'm looking for the equivalent of something like: ...
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  • 116k
10402votes
37answers
4.3mviews

How do I undo 'git add' before commit?

I mistakenly added files to Git using the command: git add myfile.txt I have not yet run git commit. Is there a way to undo this, so these files won't be included in the commit?
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  • 143k
10302votes
36answers
4.1mviews

How do I rename a local Git branch?

I don't want to rename a remote branch, as described in Rename master branch for both local and remote Git repositories. How can I rename a local branch which hasn't been pushed to a remote repository?...
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  • 112k
9697votes
29answers
906kviews

What is the "-->" operator in C/C++?

After reading Hidden Features and Dark Corners of C++/STL on comp.lang.c++.moderated, I was completely surprised that the following snippet compiled and worked in both Visual Studio 2008 and G++ 4.4. ...
8911votes
30answers
1.7mviews

What and where are the stack and heap?

Programming language books explain that value types are created on the stack, and reference types are created on the heap, without explaining what these two things are. I haven't read a clear ...
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  • 89.1k
8833votes
57answers
3.1mviews

Can comments be used in JSON?

Can I use comments inside a JSON file? If so, how?
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8545votes
48answers
6.5mviews

How do I force "git pull" to overwrite local files?

How do I force an overwrite of local files on a git pull? The scenario is the following: A team member is modifying the templates for a website we are working on They are adding some images to the ...
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8366votes
10answers
703kviews

Why does HTML think “chucknorris” is a color?

Why do certain random strings produce colors when entered as background colors in HTML? For example, the following code produces a page with a red background across all browsers and platforms: <...
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  • 82.8k
8328votes
63answers
3.0mviews

How do I check if an element is hidden in jQuery?

Is it possible to toggle the visibility of an element, using the functions .hide(), .show() or .toggle()? How would you test if an element is visible or hidden?
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