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1500 questions
1131
votes
16 answers
What is the difference between public, private, and protected?
When and why should I use public, private, and protected functions and variables inside a class? What is the difference between them?
Examples:
// Public
public $variable;
public function doSomething() {
// ...
}
// Private
private…
Adam Halasz
- 57,421
- 66
- 149
- 213
1130
votes
19 answers
How to get the sizes of the tables of a MySQL database?
I can run this query to get the sizes of all tables in a MySQL database:
show table status from myDatabaseName;
I would like some help in understanding the results. I am looking for tables with the largest sizes.
Which column should I look at?
JPashs
- 13,044
- 10
- 42
- 65
1130
votes
29 answers
How to add 30 minutes to a JavaScript Date object?
I'd like to get a Date object which is 30 minutes later than another Date object. How do I do it with JavaScript?
Morgan Cheng
- 73,950
- 66
- 171
- 230
1129
votes
28 answers
Selecting and manipulating CSS pseudo-elements such as ::before and ::after using JavaScript
Is there any way to select/manipulate CSS pseudo-elements such as ::before and ::after (and the old version with one semi-colon) using jQuery?
For example, my stylesheet has the following rule:
.span::after{ content:'foo' }
How can I change 'foo'…
JBradwell
- 11,433
- 3
- 15
- 8
1129
votes
17 answers
:: (double colon) operator in Java 8
I was exploring the Java 8 source and found this particular part of code very surprising:
// Defined in IntPipeline.java
@Override
public final OptionalInt reduce(IntBinaryOperator op) {
return…
Narendra Pathai
- 41,187
- 18
- 82
- 120
1128
votes
108 answers
R cannot be resolved - Android error
I just downloaded and installed the new Android SDK. I wanted to create a simple application to test drive it.
The wizard created this code:
package eu.mauriziopz.gps;
import android.app.Activity;
import android.os.Bundle;
public class ggps…
Maurizio Pozzobon
- 3,044
- 7
- 34
- 44
1128
votes
24 answers
How is an HTTP POST request made in node.js?
How can I make an outbound HTTP POST request, with data, in node.js?
Mark
- 67,098
- 47
- 117
- 162
1128
votes
24 answers
How to create a directory if it doesn't exist using Node.js
Is the following the right way to create a directory if it doesn't exist?
It should have full permission for the script and readable by others.
var dir = __dirname + '/upload';
if (!path.existsSync(dir)) {
fs.mkdirSync(dir, 0744);
}
Whisher
- 31,320
- 32
- 120
- 201
1127
votes
11 answers
How to concatenate (join) items in a list to a single string
How do I concatenate a list of strings into a single string?
For example, given ['this', 'is', 'a', 'sentence'], how do I get "this-is-a-sentence"?
For handling a few strings in separate variables, see How do I append one string to another in…
alvas
- 115,346
- 109
- 446
- 738
1126
votes
30 answers
How can I get the application's path in a .NET console application?
How do I find the application's path in a console application?
In Windows Forms, I can use Application.StartupPath to find the current path, but this doesn't seem to be available in a console application.
JSmyth
- 11,993
- 3
- 23
- 18
1126
votes
41 answers
Checking whether a variable is an integer or not
How do I check whether a variable is an integer?
Hulk
- 32,860
- 62
- 144
- 215
1126
votes
16 answers
Download a file with Android, and showing the progress in a ProgressDialog
I am trying to write a simple application that gets updated. For this I need a simple function that can download a file and show the current progress in a ProgressDialog. I know how to do the ProgressDialog, but I'm not sure how to display the…
Tom Leese
- 19,309
- 12
- 45
- 70
1126
votes
6 answers
How do I use $scope.$watch and $scope.$apply in AngularJS?
I don't understand how to use $scope.$watch and $scope.$apply. The official documentation isn't helpful.
What I don't understand specifically:
Are they connected to the DOM?
How can I update DOM changes to the model?
What is the connection point…
ilyo
- 35,851
- 46
- 106
- 159
1125
votes
12 answers
When should I use curly braces for ES6 import?
It seems to be obvious, but I found myself a bit confused about when to use curly braces for importing a single module in ES6. For example, in the React-Native project I am working on, I have the following file and its content:
File…
TonyW
- 18,375
- 42
- 110
- 183
1125
votes
18 answers
What's the difference between git reset --mixed, --soft, and --hard?
I'm looking to split a commit up and not sure which reset option to use.
I was looking at the page In plain English, what does "git reset" do?, but I realized I don't really understand what the git index or staging area is and thus the explanations…
Michael Chinen
- 17,737
- 5
- 33
- 45