Tutorial by Examples: l

Cluster Example

A single instance of Node.js runs in a single thread. To take advantage of multi-core systems, application can be launched in a cluster of Node.js processes to handle the load. The cluster module allows you to easily create child processes that all share server ports. Following example create the ...

Node.js • Cluster Module

Hello World

interface IGreeter { void Greet(); } class Greeter : IGreeter { public void Greet() { Console.WriteLine("Hello World"); } } class SpanishGreeter : IGreeter { public void Greet() { Console.WriteLine("Hola Mundo"); } ...

unity-container • Getting started with unity-container

Creating a component from multiple modules

Dagger 2 supports creating a component from multiple modules. You can create your component this way: @Singleton @Component(modules = {GeneralPurposeModule.class, SpecificModule.class}) public interface MyMultipleModuleComponent { void inject(MyFragment myFragment); void inject(MyServic...

Android • Dagger 2

Basic Zero Values

Variables in Go are always initialized whether you give them a starting value or not. Each type, including custom types, has a zero value they are set to if not given a value. var myString string // "" - an empty string var myInt int64 // 0 - applies to all types of int an...

Go • Zero values

More Complex Zero Values

In slices the zero value is an empty slice. var myIntSlice []int // [] - an empty slice Use make to create a slice populated with values, any values created in the slice are set to the zero value of the type of the slice. For instance: myIntSlice := make([]int, 5) // [0, 0, 0, 0, 0] - a s...

Go • Zero values

Struct Zero Values

When creating a struct without initializing it, each field of the struct is initialized to its respective zero value. type ZeroStruct struct { myString string myInt int64 myBool bool } func main() { var myZero = ZeroStruct{} fmt.Printf("Zero values are: %q, %d...

Go • Zero values

Layout Inheritance

A layout is a view file, which is extended by other views which inject blocks of code into their parent. For example: parent.blade.php: <html> <head> <style type='text/css'> @yield('styling') </style> </head> <body> ...

Laravel • Blade Templates

Delete All Orphan Nodes

Orphan nodes/vertices are those lacking all relationships/edges. MATCH (n) WHERE NOT (n)--() DELETE n

neo4j • Cypher

Using twitter-bootstrap `btn` class

btn class of Twitter-bootstrap can be used with any of the following html elements. anchor button input with both type="button" and type="submit" Below are examples of all possible use cases of btn class <a class="btn" href="#" role="button&qu...

twitter-bootstrap-3 • Buttons in twitter-bootstrap-3

Creating a boolean array

A boolean array can be created manually by using dtype=bool when creating the array. Values other than 0, None, False or empty strings are considered True. import numpy as np bool_arr = np.array([1, 0.5, 0, None, 'a', '', True, False], dtype=bool) print(bool_arr) # output: [ True True False ...

numpy • Boolean Indexing

Classes with operator() (Functors)

Every class which overloads the operator() can be used as a function object. These classes can be written by hand (often referred to as functors) or automatically generated by the compiler by writing Lambdas from C++11 on. struct Person { std::string name; unsigned int age; }; // Func...

C++ • Callable Objects

Using VIm's fileformat

When Vim opens a file with <CR><NL> line endings (common on MSDOS based operating systems, also called CRLF) it will set fileformat to dos, you can check what with: :set fileformat? fileformat=dos Or just :set ff? fileformat=dos To convert it to <NL> line endings (com...

vim • Converting text files from DOS to UNIX with vi

Hello World

HelloWorld.proj <Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003" DefaultTargets="SayHello"> <!-- Properties can be passed as command line parameters. i.e. /p:Name=MyName or /p:Name="My Name" (Use quotes if the value includes ...

msbuild • Getting started with msbuild

Its null-safe

If there is a null object on the collection it not throws a NPE, it returns a null instead: assert ['cat', 'dog', 'fish', null]*.length() == [3, 3, 4, null] Using it directly in a null object it's also null-safe: def nullCollection = null assert nullCollection*.length() == null

groovy • Spread Operator

Understanding stand-alone media files

The sample content used here is Tears of Steel, by Blender Foundation. Specifically, we will use the download titled "HD 720p (~365MB, mov, 2.0)". This is a single file that ends with the extension "mov" and will play in just about any modern media player. Note that the download...

video • Getting started with video

From simple to complex

Same as, with writing classes - start with the simple cases, then add requirement (aka tests) and implementation (aka production code) case by case: [Test] public void EnsureThat_IsLeapYearIfDecimalMultipleOf4() {...} [Test] public void EnsureThat_IsNOTLeapYearIfDecimalMultipleOf100 {...} [Tes...

unit-testing • Unit Testing: Best Practices

Run application locally

Following example requires that node.js is installed and npm is available. Full working code can be forked from GitHub @ https://github.com/mikkoviitala/angular-grunt-run-local Usually one of the first things you want to do when developing new web application is to make it run locally. Below ...

AngularJS • Grunt tasks

Application Root Module

import { NgModule } from '@angular/core'; import { BrowserModule } from '@angular/platform-browser'; import { AppComponent } from './app.component'; @NgModule({ imports: [ BrowserModule ], declarations: [ AppComponent ], bootstrap: [ AppComponent ] }) export class AppModul...

Angular 2 • Bootstrap Empty module in angular 2

Example for odeset

First we initialize our initial value problem we want to solve. odefun = @(t,y) cos(y).^2*sin(t); tspan = [0 16*pi]; y0=1; We then use the ode45 function without any specified options to solve this problem. To compare it later we plot the trajectory. [t,y] = ode45(odefun, tspan, y0); plot(t,...

MATLAB Language • Ordinary Differential Equations (ODE) Solvers

Enable Scheduling

Spring provides a useful task scheduling support. To enable it, just annotate any of your @Configuration classes with @EnableScheduling: @Configuration @EnableScheduling public class MyConfig { // Here it goes your configuration }

spring • Task Execution and Scheduling