All Questions
24,202,291
questions
5403
votes
22
answers
1.9m
views
What's the difference between tilde(~) and caret(^) in package.json?
After I upgraded to the latest stable node and npm, I tried npm install moment --save. It saves the entry in the package.json with the caret ^ prefix. Previously, it was a tilde ~ prefix.
Why are ...
- 91.4k
5397
votes
34
answers
5.2m
views
Regular expression to match a line that doesn't contain a word
I know it's possible to match a word and then reverse the matches using other tools (e.g. grep -v). However, is it possible to match lines that do not contain a specific word, e.g. hede, using a ...
5390
votes
36
answers
3.6m
views
How do I resolve merge conflicts in a Git repository?
How do I resolve merge conflicts in my Git repository?
- 121k
5386
votes
37
answers
1.6m
views
How do I add an empty directory to a Git repository?
How do I add an empty directory (that contains no files) to a Git repository?
- 138k
5380
votes
34
answers
4.4m
views
How do I make a flat list out of a list of lists?
I have a list of lists like
[
[1, 2, 3],
[4, 5, 6],
[7],
[8, 9]
]
How can I flatten it to get [1, 2, 3, 4, 5, 6, 7, 8, 9]?
If your list of lists comes from a nested list ...
- 54.6k
5379
votes
43
answers
836k
views
What is a plain English explanation of "Big O" notation?
I'd prefer as little formal definition as possible and simple mathematics.
- 61.8k
5373
votes
13
answers
3.1m
views
How do I exit Vim?
I am stuck and cannot escape. It says:
type :quit<Enter> to quit VIM
But when I type that it simply appears in the object body.
- 51.6k
5275
votes
106
answers
4.2m
views
How do I make the first letter of a string uppercase in JavaScript?
How do I make the first character of a string uppercase if it's a letter, but not change the case of any of the other letters?
For example:
"this is a test" → "This is a test"
&...
- 53.4k
5242
votes
27
answers
2.6m
views
What is the difference between "INNER JOIN" and "OUTER JOIN"?
Also, how do LEFT OUTER JOIN, RIGHT OUTER JOIN, and FULL OUTER JOIN fit in?
- 57.3k
5201
votes
68
answers
4.9m
views
How do I check whether a checkbox is checked in jQuery?
I need to check the checked property of a checkbox and perform an action based on the checked property using jQuery.
For example, if the age checkbox is checked, then I need to show a textbox to enter ...
5161
votes
67
answers
3.0m
views
What is the most efficient way to deep clone an object in JavaScript?
What is the most efficient way to clone a JavaScript object? I've seen obj = eval(uneval(o)); being used, but that's non-standard and only supported by Firefox. I've done things like obj = JSON.parse(...
5110
votes
25
answers
838k
views
Reference Guide: What does this symbol mean in PHP? (PHP Syntax)
What is this?
This is a collection of questions that come up now and then about syntax in PHP. This is also a Community Wiki, so everyone is invited to participate in maintaining this list.
This ...
5105
votes
128
answers
4.9m
views
How can I horizontally center an element?
How can I horizontally center a <div> within another <div> using CSS?
<div id="outer">
<div id="inner">Foo foo</div>
</div>
4981
votes
32
answers
1.3m
views
What is the difference between a URI, a URL, and a URN? [closed]
What is the difference between a URL, a URI, and a URN?
- 58.8k
4951
votes
62
answers
3.6m
views
How do I check if an array includes a value in JavaScript?
What is the most concise and efficient way to find out if a JavaScript array contains a value?
This is the only way I know to do it:
function contains(a, obj) {
for (var i = 0; i < a.length; i++...
- 75.1k