Consider writing a "hello world!" program in c. Lets say our source code is in a file called source.c, now in order to run our program we need to compile it, typically on Linux (using gcc) we would need to type $> gcc source.c -o output where output is the name of the executable to be g...
Laravel's events allows to implement the Observer pattern. This can be used to send a welcome email to a user whenever they register on your application.
New events and listeners can be generated using the artisan command line utility after registering the event and their particular listener in App...
DATA: <TABLE NAME> TYPE <SORTED|STANDARD|HASHED> TABLE OF <TYPE NAME>
WITH <UNIQUE|NON-UNIQUE> KEY <FIELDS FOR KEY>.
Standard Table
This table has all of the entries stored in a linear fashion and records are accessed in a linear way. For large table sizes, ...
Though the transaction class method is called on some ActiveRecord class, the objects within the transaction block need not all be instances of that class. This is because transactions are per-database connection, not per-model.
In this example a balance record is transactionally saved even though ...
Using NuGet
Install-Package Cirrious.FluentLayout
An expanded example based on the starter example at the GitHub Page, a simple first name, last name labels and fields all stacked one on top of the other:
public override void ViewDidLoad()
{
//create our labels and fields
var firstNa...
Built-in functionals: lapply(), sapply(), and mapply()
R comes with built-in functionals, of which perhaps the most well-known are the apply family of functions. Here is a description of some of the most common apply functions:
lapply() = takes a list as an argument and applies the specified ...
User-defined functionals
Users can create their own functionals to varying degrees of complexity. The following examples are from Functionals by Hadley Wickham:
randomise <- function(f) f(runif(1e3))
lapply2 <- function(x, f, ...) {
out <- vector("list", length(x...
To print a test field (TestField) from a test feature class (TestFC) in a test file geodatabase (Test.gdb) located in a temporary folder (C:\Temp):
with arcpy.da.SearchCursor(r"C:\Temp\Test.gdb\TestFC",["TestField"]) as cursor:
for row in cursor:
print row[0]
Foreach allows a less error-prone and better readable way to iterate collections. The attribute ref can be used if we want to directly modify the iterated element.
void main()
{
import std.stdio : writeln;
int[] arr = [1, 3, 4];
foreach (ref el; arr)
{
el *= 2;
}
...
from django.db import models
from django.contrib.auth.models import User
from django.db.models.signals import post_save
from django.dispatch import receiver
class UserProfile(models.Model):
user = models.OneToOneField(User, related_name='user')
website = models.URLField(default='', ...
If an arithmetic operation that yields a floating point type produces a value that is not in the range of representable values of the result type, the behavior is undefined according to the C++ standard, but may be defined by other standards the machine might conform to, such as IEEE 754.
float x =...
When either a signed or unsigned integer is converted to a signed integer type, and its value is not representable in the destination type, the value produced is implementation-defined. Example:
// Suppose that on this implementation, the range of signed char is -128 to +127 and
// the range of un...
Sometimes in a development or testing environment, the SSL certificate chain might not have been fully established (yet).
To continue developing and testing, you can turn off SSL verification programmatically by installing an "all-trusting" trust manager:
try {
// Create a trust mana...
Config values can be set in three ways:
Via private static variables on any class within a SilverStripe project
Via yaml config files (stored in module-folder/_config/[file].yml)
Via PHP at run time (Config::inst()->update('Director', 'environment_type', 'dev')
Generally it's best to se...
If you want to show local notification immediately, you should call:
Swift 3
UIApplication.shared.presentLocalNotificationNow(notification)
Swift 2
UIApplication.sharedApplication().presentLocalNotificationNow(notification)
Objective-C
[[UIApplication sharedApplication] presentLocalNotific...
Create a new Console Application
Add the NuGet package Microsoft.CodeAnalysis
Import the namespaces Microsoft.CodeAnalysis.MSBuild, System.Linq and Microsoft.CodeAnalysis.CSharp.Syntax
Write the following example code in the Main method:
// Declaring a variable with the current project file ...
var syntaxTree = CSharpSyntaxTree.ParseText(
@"using System;
using System.Collections;
using System.Linq;
using System.Text;
namespace HelloWorldApplication
{
class Program
{
static void Main(string[] args)
{
Console.WriteLine(""Hello World"");
}
}
}");
...
