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How do I concatenate or merge arrays in Swift?
.../merge two arrays.
#1. Merge two arrays into a new array with Array's +(_:_:) generic operator
Array has a +(_:_:) generic operator. +(_:_:) has the following declaration:
Creates a new collection by concatenating the elements of a collection and a sequence.
static func + <Other>(lhs...
What is a plain English explanation of “Big O” notation?
...sions in non-academic settings. Apologies for any confusion caused.
Big O complexity can be visualized with this graph:
The simplest definition I can give for Big-O notation is this:
Big-O notation is a relative representation of the complexity of an algorithm.
There are some important and deliber...
How to avoid explicit 'self' in Python?
...e, and always know whether you are accessing a member or not:
class A(some_function()):
def f(self):
self.member = 42
self.method()
That's the complete code! (some_function returns the type used as a base.)
Another, where the methods of a class are dynamically composed:
class B(objec...
Spring Cache @Cacheable - not working while calling from another method of the same bean
...in the same class will not get the cached value.
From https://code.google.com/p/ehcache-spring-annotations/wiki/UsingCacheable
Only external method calls coming in through the proxy are
intercepted. This means that self-invocation, in effect, a method
within the target object calling anothe...
Calling closure assigned to object property directly
...sn't work on a StdClass.
Before PHP7, you'd have to implement the magic __call method to intercept the call and invoke the callback (which is not possible for StdClass of course, because you cannot add the __call method)
class Foo
{
public function __call($method, $args)
{
if(is_...
How to remove an element from a list by index
...ook at svn.python.org/projects/python/trunk/Objects/listobject.c how PyList_GetItem() essentially returns ((PyListObject *)op) -> ob_item[i]; - the ith element of an array.
– glglgl
Sep 9 '13 at 7:53
...
What use is find_package() if you need to specify CMAKE_MODULE_PATH anyway?
...eUploader: {
brandingHtml: "Powered by \u003ca href=\"https://imgur.com/\"\u003e\u003csvg class=\"svg-icon\" width=\"50\" height=\"18\" viewBox=\"0 0 50 18\" fill=\"none\" xmlns=\"http://www.w3.org/2000/svg\"\u003e\u003cpath d=\"M46.1709 9.17788C46.1709 8.26454 46.2665 7.94324 4...
How do I join two SQLite tables in my Android application?
...a.questionid;
This is from memory so there may be some syntactic issues.
http://www.sqlite.org/lang_createview.html
I mention this approach because then you can use SQLiteQueryBuilder with the view as you implied that it was preferred.
...
How to keep up with the latest versions of Node.js in Ubuntu? PPA? Compiling?
...
Most up-to-date ppa for nodejs https://launchpad.net/~chris-lea/+archive/node.js/
sudo add-apt-repository ppa:chris-lea/node.js
sudo apt-get update
sudo apt-get install nodejs
NOTE: If your system does not have add-apt-repository, it can be installe...
How do JavaScript closures work?
...ing
In the following code, function onClick closes over variable BACKGROUND_COLOR.
const $ = document.querySelector.bind(document)
const BACKGROUND_COLOR = 'rgba(200,200,242,1)'
function onClick() {
$('body').style.background = BACKGROUND_COLOR
}
$('button').addEventListener('click', onClick...