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What is “callback hell” and how and why does RX solve it?
...ions we get here on StackOverflow asking how to do this kind of thing is a testament to how confusing it is :)
3) Why does it occur ?
It occurs because in JavaScript the only way to delay a computation so that it runs after the asynchronous call returns is to put the delayed code inside a callback...
What is the Python equivalent of static variables inside a function?
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Many people have already suggested testing 'hasattr', but there's a simpler answer:
def func():
func.counter = getattr(func, 'counter', 0) + 1
No try/except, no testing hasattr, just getattr with a default.
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List all sequences in a Postgres db 8.1 with SQL
... last value of a sequence use the following query:
SELECT last_value FROM test_id_seq;
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Filter rows which contain a certain string
...str", "", object) # -> "ingr"
Benchmark
The results of the benchmark test are as follows. For large dataframe, str_detect is faster.
library(rbenchmark)
library(tidyverse)
# The data. Data expo 09. ASA Statistics Computing and Graphics
# http://stat-computing.org/dataexpo/2009/the-data.html...
C# 4.0 optional out/ref arguments
...worked well for my real use case (a function that provides data for a unit test, and where a new unit test needed access to some internal state not present in the return value).
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Password masking console application
... the currently accepted answer, the final else clause would benefit from a test if (!char.IsControl(i.KeyChar)) (or at the very least if (i.KeyChar != '\u0000')).
– Peter Taylor
Nov 11 '15 at 12:22
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jQuery.click() vs onClick
...rison in performance at jQuery vs Native Element Performance.
I've done a test in Firefox 16.0 32-bit on Windows Server 2008 R2 / 7 64-bit
$('span'); // 6,604 operations per second
document.getElementsByTagName('span'); // 10,331,708 operations/sec
For click events, check Native Browser events v...
How to debug in Django, the good way? [closed]
...as per my answer below. Gives you manage.py runserver --pdb and manage.py test --pdb commands.
– Tom Christie
Jul 30 '11 at 0:14
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Creating a custom JButton in Java
...existing JButton class to draw a circle to the right of the text.
package test;
import java.awt.Color;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Graphics;
import javax.swing.JButton;
import javax.swing.JFrame;
public class MyButton extends ...
How to send FormData objects with Ajax-requests in jQuery? [duplicate]
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Tested in Firefox, and Chrome. This is the solution.
– Šime Vidas
Jan 11 '13 at 1:44
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