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Mixin vs inheritance
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Mixins in Comparison and Contrast with Abstract Base Classes
Both are a form of parent class that is not intended to be instantiated.
A mixin provides functionality, but is unable to directly use it. A user is intended to use it through a (sub)class.
An abstract base class provides an interface...
Is it possible to have multiple statements in a python lambda expression?
...en better: lambda x: [f1(x), f2(x)][-1], it will return calculation result form last expression, as probably expected.
– Anton Ovsyannikov
Aug 29 '19 at 19:05
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What is 'define' used for in JavaScript (aside from the obvious)?
...fine function from RequireJS, in particular the "define with dependencies" form of that function. It is used to define a "module":
A module is different from a traditional script file in that it
defines a well-scoped object that avoids polluting the global
namespace. It can explicitly list i...
Is 23,148,855,308,184,500 a magic number, or sheer chance?
...n as settlement, and its done by sending a plain text file in a very rigid format. (This was all developed decades ago and the number of systems now using it makes it hard to modernise)
Each transaction appears in the file as a line of text, and part of that is the transaction value. This field sho...
Using GCC to produce readable assembly?
...> gcc -g -c test.c
> objdump -d -M intel -S test.o
test.o: file format elf32-i386
Disassembly of section .text:
00000000 <main>:
#include <stdio.h>
int main(void)
{
0: 55 push ebp
1: 89 e5 mov ebp,esp
3: 83 e4 f0 ...
RGB to hex and hex to RGB
How to convert colors in RGB format to hex format and vice versa?
50 Answers
50
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How to handle floats and decimal separators with html5 input type number
... pattern attribute
With the pattern attribute you can specify the allowed format with a regular expression in a HTML5 compatible way. Here you could specify that the comma character is allowed and a helpful feedback message if the pattern fails.
<input type="number" pattern="[0-9]+([,\.][0-9]+...
What is `params.require(:person).permit(:name, :age)` doing in Rails 4?
...are passed into the model.
It looks a lot like the whitelisting that was formerly included in ActiveRecord models, but it makes more sense for it to be in the controller.
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How and where are Annotations used in Java?
...s used to describe the element and clarify its meaning.
Prior to JDK5, information that is now expressed with annotations needed to be stored somewhere else, and XML files were frequently used. But it is more convenient to use annotations because they will belong to the Java code itself, and are h...
How to load JAR files dynamically at Runtime?
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You should take a look at OSGi, e.g. implemented in the Eclipse Platform. It does exactly that. You can install, uninstall, start and stop so called bundles, which are effectively JAR files. But it does a little more, as it offers e.g. services that can be dynamically discovered in JAR files ...