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27287 votes
25 answers
1.9m views

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

In this C++ code, sorting the data (before the timed region) makes the primary loop ~6x faster: #include <algorithm> #include <ctime> #include <iostream> int main() { // ...
GManNickG's user avatar
  • 501k
26504 votes
109 answers
14.5m views

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 do I undo those commits from the local repository?
20374 votes
41 answers
11.7m views

How do I delete a Git branch 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 origin/bugfix error: branch 'origin/bugfix' not found....
13858 votes
37 answers
3.5m views

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

What are the differences between git pull and git fetch?
Pablo Fernandez's user avatar
12947 votes
52 answers
3.4m views

What does the "yield" keyword do in Python?

What functionality does the yield keyword in Python provide? For example, I'm trying to understand this code1: def _get_child_candidates(self, distance, min_dist, max_dist): if self._leftchild and ...
Alex. S.'s user avatar
  • 146k
11979 votes
155 answers
12.8m views

How can I remove a specific item from an array in JavaScript?

How do I remove a specific value from an array? Something like: array.remove(value); Constraints: I have to use core JavaScript. Frameworks are not allowed.
Walker's user avatar
  • 133k
11684 votes
41 answers
5.5m views

How can I rename a local Git branch?

How can I rename a local branch which has not yet been pushed to a remote repository? Related: Rename master branch for both local and remote Git repositories How do I rename both a Git local and ...
Forrest's user avatar
  • 126k
11581 votes
39 answers
3.9m views

Which JSON content type do I use?

There are many "standards" for the JSON content type: application/json application/x-javascript text/javascript text/x-javascript text/x-json Which one do I use, and where? I assume ...
Oli's user avatar
  • 239k
11395 votes
38 answers
5.7m views

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. How do I undo this so that these changes will not be included in the commit?
oz10's user avatar
  • 157k
10168 votes
26 answers
1.0m views

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. ...
9719 votes
54 answers
8.7m views

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

How do I force an overwrite of local files on a git pull? My local repository contains a file of the same filename as on the server. error: Untracked working tree file 'example.txt' would be ...
Jakub Troszok's user avatar
9580 votes
62 answers
3.6m views

Can comments be used in JSON?

Can I use comments inside a JSON file? If so, how?
Michael Gundlach's user avatar
9444 votes
31 answers
1.9m views

What and where are the stack and heap?

What are the stack and heap? Where are they located physically in a computer's memory? To what extent are they controlled by the OS or language run-time? What is their scope? What determines their ...
mattshane's user avatar
  • 94.5k
8842 votes
9 answers
783k views

Why does HTML think “chucknorris” is a color?

Why do certain random strings produce colors when entered as background colors in HTML? For example, bgcolor="chucknorris" produces a red background: <body bgcolor="chucknorris"> ...
user456584's user avatar
  • 88.2k
8700 votes
44 answers
8.8m views

How do I check out a remote Git branch?

Somebody pushed a branch called test with git push origin test to a shared repository. I can see the branch with git branch -r. How do I check out the remote test branch? I've tried: git checkout ...
Juri Glass's user avatar
  • 90.5k
8697 votes
67 answers
3.2m views

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

How do I toggle the visibility of an element using .hide(), .show(), or .toggle()? How do I test if an element is visible or hidden?
Philip Morton's user avatar
8493 votes
32 answers
1.2m views

What does "use strict" do in JavaScript, and what is the reasoning behind it?

Recently, I ran some of my JavaScript code through Crockford's JSLint, and it gave the following error: Problem at line 1 character 1: Missing "use strict" statement. Doing some searching, ...
Mark Rogers's user avatar
  • 97.3k
8337 votes
35 answers
2.5m views

How do I make Git forget about a file that was tracked, but is now in .gitignore?

I put a file that was previously being tracked by Git onto the .gitignore list. However, the file still shows up in git status after it is edited. How do I force Git to completely forget the file?
Ivan's user avatar
  • 102k
8257 votes
47 answers
4.7m views

What does if __name__ == "__main__": do?

What does this do, and why should one include the if statement? if __name__ == "__main__": print("Hello, World!") If you are trying to close a question where someone should be ...
Devoted's user avatar
  • 181k
8176 votes
43 answers
3.3m views

How do I remove local (untracked) files from the current Git working tree?

How do I delete untracked local files from the current working tree?
readonly's user avatar
  • 351k
7952 votes
31 answers
2.9m views

Does Python have a ternary conditional operator?

Is there a ternary conditional operator in Python?
Devoted's user avatar
  • 181k
7750 votes
91 answers
2.7m views

Is Java "pass-by-reference" or "pass-by-value"?

I always thought Java uses pass-by-reference. However, I read a blog post which claims that Java uses pass-by-value. I don't think I understand the distinction the author is making. What is the ...
7698 votes
58 answers
7.9m views

How do I redirect to another webpage?

How can I redirect the user from one page to another using jQuery or pure JavaScript?
venkatachalam's user avatar
7641 votes
27 answers
3.9m views

How to modify existing, unpushed commit messages?

I wrote the wrong thing in a commit message. How can I change the message? The commit has not been pushed yet.
Laurie Young's user avatar
7637 votes
42 answers
1.2m views

var functionName = function() {} vs function functionName() {}

I've recently started maintaining someone else's JavaScript code. I'm fixing bugs, adding features and also trying to tidy up the code and make it more consistent. The previous developer used two ways ...
Richard Garside's user avatar
7615 votes
86 answers
1.6m views

How do JavaScript closures work?

How would you explain JavaScript closures to someone with a knowledge of the concepts they consist of (for example functions, variables and the like), but does not understand closures themselves? I ...
7609 votes
41 answers
11.3m views

How do I revert a Git repository to a previous commit?

How do I revert from my current state to a snapshot made on a certain commit? If I do git log, then I get the following output: $ git log commit a867b4af366350be2e7c21b8de9cc6504678a61b` Author: Me &...
Crazy Serb's user avatar
  • 76.3k
7568 votes
11 answers
806k views

Why is subtracting these two epoch-milli Times (in year 1927) giving a strange result?

If I run the following program, which parses two date strings referencing times 1 second apart and compares them: public static void main(String[] args) throws ParseException { SimpleDateFormat sf ...
Freewind's user avatar
  • 197k
7552 votes
68 answers
1.3m views

What is the difference between String and string in C#?

What are the differences between these two, and which one should I use? string s = "Hello world!"; String s = "Hello world!";
7535 votes
56 answers
11.2m views

Find all files containing a specific text (string) on Linux?

How do I find all files containing a specific string of text within their file contents? The following doesn't work. It seems to display every single file in the system. find / -type f -exec grep -H '...
Nathan's user avatar
  • 76.8k
7515 votes
39 answers
3.2m views

How do I remove a property from a JavaScript object?

Given an object: let myObject = { "ircEvent": "PRIVMSG", "method": "newURI", "regex": "^http://.*" }; How do I remove the property ...
johnstok's user avatar
  • 97.7k
7406 votes
3 answers
8.1m views

How to check whether a string contains a substring in JavaScript?

Usually I would expect a String.contains() method, but there doesn't seem to be one. What is a reasonable way to check for this?
7402 votes
26 answers
1.2m views

What are metaclasses in Python?

What are metaclasses? What are they used for?
Bite code's user avatar
  • 591k
7184 votes
41 answers
5.6m views

How do I check whether a file exists without exceptions?

How do I check whether a file exists or not, without using the try statement?
spence91's user avatar
  • 79.1k
6983 votes
43 answers
3.4m views

How do I merge two dictionaries in a single expression in Python?

I want to merge two dictionaries into a new dictionary. x = {'a': 1, 'b': 2} y = {'b': 3, 'c': 4} z = merge(x, y) >>> z {'a': 1, 'b': 3, 'c': 4} Whenever a key k is present in both ...
Carl Meyer's user avatar
  • 125k
6708 votes
42 answers
2.1m views

How do I return the response from an asynchronous call?

How do I return the response/result from a function foo that makes an asynchronous request? I am trying to return the value from the callback, as well as assigning the result to a local variable ...
Felix Kling's user avatar
6600 votes
23 answers
1.8m views

Move the most recent commit(s) to a new branch with Git

How do I move my recent commits on master to a new branch, and reset master to before those commits were made? e.g. From this: master A - B - C - D - E To this: newbranch C - D - E / ...
Mark A. Nicolosi's user avatar
6450 votes
34 answers
4.3m views

How do I change the URI (URL) for a remote Git repository?

I have a repo (origin) on a USB key that I cloned on my hard drive (local). I moved "origin" to a NAS and successfully tested cloning it from here. I would like to know if I can change the ...
Bite code's user avatar
  • 591k
6391 votes
34 answers
1.5m views

What is the difference between px, dip, dp, and sp?

What is the difference between the units of measure px, dip, dp, and sp?
capecrawler's user avatar
  • 67.9k
6374 votes
42 answers
3.5m views

What is the difference between POST and PUT in HTTP?

Background Information Analysis: According to RFC 2616, § 9.5, POST is used to create a resource: The POST method is used to request that the origin server accept the entity enclosed in the request ...
alex's user avatar
  • 75.5k
6331 votes
72 answers
4.4m views

How do I include a JavaScript file in another JavaScript file?

How do I include a JavaScript file inside another JavaScript file, similar to @import in CSS?
Alec Smart's user avatar
  • 95.3k
6309 votes
40 answers
4.2m views

How do I discard unstaged changes in Git?

How do I discard changes in my working copy that are not in the index?
readonly's user avatar
  • 351k
6289 votes
38 answers
2.3m views

What is the difference between "let" and "var"?

ECMAScript 6 introduced the let statement. I've heard that it's described as a local variable, but I'm still not quite sure how it behaves differently than the var keyword. What are the differences? ...
TM.'s user avatar
  • 110k
6278 votes
77 answers
2.6m views

How do I get the directory where a Bash script is located from within the script itself?

How do I get the path of the directory in which a Bash script is located, inside that script? I want to use a Bash script as a launcher for another application. I want to change the working directory ...
6168 votes
66 answers
4.8m views

How do I execute a program or call a system command?

How do I call an external command within Python as if I had typed it in a shell or command prompt?
freshWoWer's user avatar
  • 63.5k
6104 votes
45 answers
2.7m views

How to disable text selection highlighting

For anchors that act like buttons (for example, the buttons on the sidebar of this Stack Overflow page titled Questions, Tags, and Users) or tabs, is there a CSS standard way to disable the ...
user avatar
5766 votes
27 answers
6.5m views

Reset local repository branch to be just like remote repository HEAD

How do I reset my local branch to be just like the branch on the remote repository? I tried: git reset --hard HEAD But git status claims I have modified files: On branch master Changes to be ...
hap497's user avatar
  • 160k
5762 votes
37 answers
3.1m views

How can I reset or revert a file to a specific revision?

How can I revert a modified file to its previous revision at a specific commit hash (which I determined via git log and git diff)?
Hates_'s user avatar
  • 68k
5752 votes
19 answers
1.7m views

What is the maximum length of a URL in different browsers?

What is the maximum length of a URL for each browser? Is a maximum URL length part of the HTTP specification?
Sander Versluys's user avatar
5721 votes
41 answers
5.3m views

Loop (for each) over an array in JavaScript

How can I loop through all the entries in an array using JavaScript?
Dante1986's user avatar
  • 59.4k

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