In android, every developer uses Anonymous Class (Runnable) at least once in a project. Any Anonymous Class has a reference to its parent (activity). If we perform a long-running task, the parent activity will not be destroyed until the task is ended.
Example uses handler and Anonymous Runnable cla...
Sometimes you would want to start or remove an action on a specific node at a certain time. For example, you might want to stop a moving object when the user taps the screen. This becomes very helpful when a node has multiple actions and you only wants to access one of them.
let move = SKAction.mov...
Code
echo get_permalink( 44 , false );
Output
The link of the post id:44 without the name of the post, for example: http://website.com/category/%postname%/
Use dynamic_cast for converting pointers/references within an inheritance hierarchy.
Use static_cast for ordinary type conversions.
Use reinterpret_cast for low-level reinterpreting of bit patterns. Use with extreme caution.
Use const_cast for casting away const/volatile. Avoid this unless you ar...
Create enum of custom errors
enum RegistrationError: Error {
case invalidEmail
case invalidPassword
case invalidPhoneNumber
}
Create extension of RegistrationError to handle the Localized description.
extension RegistrationError: LocalizedError {
public var errorDescription...
The following example demonstrates using Lumen in WAMP / MAMP / LAMP environments.
To work with Lumen you need to setup couple of things first.
Composer
PHPUnit
git (not required but strongly recommended)
Assuming you have all these three components installed (at least you need composer), f...
Retrolambda lets you run Java 8 code with lambda expressions, method references and try-with-resources statements on Java 7, 6 or 5. It does this by transforming your Java 8 compiled bytecode so that it can run on an older Java runtime.
Backported Language Features:
Lambda expressions are back...
This example shows how to use mathematical operations with counters. It may be useful for loops in latex.
Addition: \addtocounter{num}{n}
this command adds n to num, where num is a counter and n is a positive integer.
Subtraction: \addtocounter{num}{-n}
this command subtracts n from num, where n...
&& chains two commands. The second one runs only if the first one exits with success.
|| chains two commands. But second one runs only if first one exits with failure.
[ a = b ] && echo "yes" || echo "no"
# if you want to run more commands within a logical c...
The | takes the output of the left command and pipes it as input the right command. Mind, that this is done in a subshell. Hence you cannot set values of vars of the calling process wihtin a pipe.
find . -type f -a -iname '*.mp3' | \
while read filename; do
mute --noise "...
There are many responsive scenarios where it's necessary to have column units exceeding 12 in a single .row element. This is known as column wrapping.
If more than 12 columns are placed within a single row, each group of
extra columns will, as one unit, wrap onto a new line.
For example, cons...
Goto accepts the use of variable value to act as the label to goto.
Example:
@echo off
echo a = 1
echo b = 2
set /p "foo=Enter option:"
goto %foo%
However, you should check the input so it will not go to somewhere that does not exist. Going to an undefined label will terminate...
Suppose we'd like to wrap the Google Maps JavaScript API google.maps:
@JS('google.maps')
library maps;
import "package:js/js.dart";
@JS()
class Map {
external Map(Location location);
external Location getLocation();
}
We now have the Map Dart class which corresponds to t...
In this example, we use this database:
"your-project-name" : {
"users" : {
"randomUserId1" : {
"display-name" : "John Doe",
"gender" : "male"
}
"randomUserId2" :...
Note: You need to know which data referenced by getReference() first before you can completely understand this example.
There are three common method to get your data from Firebase Realtime Database:
addValueEventListener()
addListenerForSingleValueEvent()
addChildEventListener()
When w...
