All Questions
2,211,583
questions
978
votes
21
answers
663k
views
Accessing an object property with a dynamically-computed name
I'm trying to access a property of an object using a dynamic name. Is this possible?
const something = { bar: "Foobar!" };
const foo = 'bar';
something.foo; // The idea is to access something.bar, ...
- 10.8k
465
votes
10
answers
96k
views
Why should I not #include <bits/stdc++.h>?
I posted a question with my code whose only #include directive was the following:
#include <bits/stdc++.h>
My teacher told me to do this, but in the comments section I was informed that I ...
863
votes
22
answers
857k
views
The useState set method is not reflecting a change immediately
I am trying to learn hooks and the useState method has made me confused. I am assigning an initial value to a state in the form of an array. The set method in useState is not working for me, both with ...
- 8,743
2694
votes
73
answers
5.4m
views
How can I get query string values in JavaScript?
Is there a plugin-less way of retrieving query string values via jQuery (or without)?
If so, how? If not, is there a plugin which can do so?
1167
votes
21
answers
306k
views
Can a local variable's memory be accessed outside its scope?
I have the following code.
#include <iostream>
int * foo()
{
int a = 5;
return &a;
}
int main()
{
int* p = foo();
std::cout << *p;
*p = 8;
std::cout << *...
1390
votes
10
answers
272k
views
Where and why do I have to put the "template" and "typename" keywords?
In templates, where and why do I have to put typename and template on dependent names?
What exactly are dependent names anyway?
I have the following code:
template <typename T, typename Tail> // ...
- 178k
2212
votes
27
answers
576k
views
What is the scope of variables in JavaScript?
What is the scope of variables in javascript? Do they have the same scope inside as opposed to outside a function? Or does it even matter? Also, where are the variables stored if they are defined ...
- 57.8k
2735
votes
65
answers
1.5m
views
How can I fix 'android.os.NetworkOnMainThreadException'?
I got an error while running my Android project for RssReader.
Code:
URL url = new URL(urlToRssFeed);
SAXParserFactory factory = SAXParserFactory.newInstance();
SAXParser parser = factory....
- 29.7k
422
votes
10
answers
105k
views
Is storing a delimited list in a database column really that bad?
Imagine a web form with a set of check boxes (any or all of them can be selected). I chose to save them in a comma separated list of values stored in one column of the database table.
Now, I know ...
- 18.5k
383
votes
15
answers
494k
views
How to reshape data from long to wide format
I'm having trouble rearranging the following data frame:
set.seed(45)
dat1 <- data.frame(
name = rep(c("firstName", "secondName"), each=4),
numbers = rep(1:4, 2),
value = rnorm(8)
)...
- 5,937
301
votes
2
answers
487k
views
How to extract and access data from JSON with PHP?
This is intended to be a general reference question and answer covering many of the never-ending "How do I access data in my JSON?" questions. It is here to handle the broad basics of decoding JSON in ...
- 26.4k
259
votes
10
answers
1.1m
views
How can I read inputs as numbers?
Why are x and y strings instead of ints in the below code?
(Note: in Python 2.x use raw_input(). In Python 3.x use input(). raw_input() was renamed to input() in Python 3.x)
play = True
while play:
...
user2509848
820
votes
15
answers
367k
views
What is a raw type and why shouldn't we use it?
Questions:
What are raw types in Java, and why do I often hear that they shouldn't be used in new code?
What is the alternative if we can't use raw types, and how is it better?
- 381k
551
votes
9
answers
150k
views
The Use of Multiple JFrames: Good or Bad Practice? [closed]
I'm developing an application which displays images, and plays sounds from a database. I'm trying to decide whether or not to use a separate JFrame to add images to the database from the GUI.
I'm ...
- 6,085
3220
votes
34
answers
2.3m
views
Using async/await with a forEach loop
Are there any issues with using async/await in a forEach loop? I'm trying to loop through an array of files and await on the contents of each file.
import fs from 'fs-promise'
async function ...
- 52.8k