Tutorial by Examples: n

Using the dynamic variable %Random%, we can get a random integer from 0 to 32767. For example: echo %random% This obviously, returns an integer from 0 to 32767. But sometimes we want it to be in a specific range, say from 1 to 100. Generating Random Numbers Within Specific Range The basic me...

Unfortunately, batch does not have a built-in method to generate alphabets, but using %random% and for loop, we can 'generate' alphabets. This is a simple idea of how this works. set /a result=(%random%*26/32768)+1 for /f "tokens=%result%" %%I in ("A B C D E F G H I J K L M N O P...

The model view controller is a very common design pattern that has been around for quite some time. This pattern focuses on reducing spaghetti code by separating classes into functional parts. Recently I have been experimenting with this design pattern in Unity and would like to lay out a basic exam...

Here is how to create your own singleton class for toast messages, If your application need to show success, warning and the danger messages for different use cases you can use this class after you have modified it to your own specifications. public class ToastGenerate { private stati...

The MyFrame class the extends JFrame and also contains the main method import javax.swing.JFrame; public class MyFrame extends JFrame{ //main method called on startup public static void main(String[] args) throws InterruptedException { //creates a frame window ...

In this example, base class Singleton provides getMessage() method that returns "Hello world!" message. It's subclasses UppercaseSingleton and LowercaseSingleton override getMessage() method to provide appropriate representation of the message. //Yeah, we'll need reflection to pull this ...

The below example uses Android.Runtime.InputStreamInvoker and Android.Runtime.OutputStreamInvoker types obtain Java.IO.InputStream and Java.IO.OutputStream. Once we have a Java.IO.InputStream instance, we can use its .Available() method to get the number of available response bytes which we can use...

Grouping with the data.table package is done using the syntax dt[i, j, by] Which can be read out loud as: "Take dt, subset rows using i, then calculate j, grouped by by." Within the dt statement, multiple calculations or groups should be put in a list. Since an alias for list() is .(), bo...

Use the following flowchart to choose the right Collection for the job. This flowchart was based off [http://i.stack.imgur.com/aSDsG.png).

parse_url(): This function parses a URL and returns an associative array containing any of the various components of the URL that are present. $url = parse_url('http://example.com/project/controller/action/param1/param2'); Array ( [scheme] => http [host] => example.com ...

explode(): Returns an array of strings, each of which is a substring of string formed by splitting it on boundaries formed by the string delimiter. This function is pretty much straight forward. $url = "http://example.com/project/controller/action/param1/param2"; $parts = explode(...

basename(): Given a string containing the path to a file or directory, this function will return the trailing name component. This function will return only the last part of an URL $url = "http://example.com/project/controller/action/param1/param2"; $parts = basename($url); // Out...

Choosing which C++ Container to use can be tricky, so here's a simple flowchart to help decide which Container is right for the job. This flowchart was based on Mikael Persson's post. This little graphic in the flowchart is from Megan Hopkins

Defined within Another Class C++ Nested Class[ref] (needs a reference to enclosing class) class Outer { class Inner { public: Inner(Outer* o) :outer(o) {} private: Outer* outer; }; }; Java [non-static] Nested Class (aka Inner Class or Member Class...

Many argue that Java is ONLY pass-by-value, but it's more nuanced than that. Compare the following C++ and Java examples to see the many flavors of pass-by-value (aka copy) and pass-by-reference (aka alias). C++ Example (complete code) // passes a COPY of the object static void passByCopy(Pa...

C++ & Java are both object-oriented languages, thus the following diagram applies to both.

Beware of using "downcasting" - Downcasting is casting down the inheritance hierarchy from a base class to a subclass (i.e. opposite of polymorphism). In general, use polymorphism & overriding instead of instanceof & downcasting. C++ Example // explicit type case required Child ...

This example shows how to to display specific property in dropdown but bind with the whole object. autocomplete-overview-example.html: <md-input-container> <input mdInput placeholder="State" [(ngModel)]="selection" [mdAutocomplete]="auto" [formCo...

data.service.ts: import { Injectable } from '@angular/core'; import { Http } from '@angular/http'; import 'rxjs/add/operator/map'; @Injectable() export class DataService { constructor(private http: Http) { } fetchData(){ return this.http.get('https://dinstruct-d4b62.firebaseio....

This example requires FormsModule and ReactiveFormsModule. Please import them in your application/module. import {FormsModule, ReactiveFormsModule} from '@angular/forms'; input-form-example.html <form class="example-form" (ngSubmit)="submit(addForm.value)" [formGroup]=&qu...