Tutorial by Examples | RIP Tutorial

Consider we are connecting MYSQL RDS with your rails application.

Steps to create MYSQL database Login to amazon account and select RDS service Select Launch DB Instance from the instance tab By defaul MYSQL Community Edition will be selected, hence click the select button Select the database purpose, say production and click next step Provide the mysql ver...

Ruby on Rails • Adding an Amazon RDS to your rails application

Introduction to regular expressions in Kotlin

This post shows how to use most of the functions in the Regex class, work with null safely related to the Regex functions, and how raw strings makes it easier to write and read regex patterns. The RegEx class To work with regular expressions in Kotlin, you need to use the Regex(pattern: String) cl...

Kotlin • Regex

Fast Asymmetric File Encryption

Asymmetric encryption is often regarded as preferable to Symmetric encryption for transferring messages to other parties. This is mainly because it negates many of the risks related to the exchange of a shared key and ensures that whilst anyone with the public key can encrypt a message for the inten...

C# Language • Cryptography (System.Security.Cryptography)

Shopify local development with Theme Kit

Shopify themes can also be developed locally. Follow the steps below to setup local development environment: Install Shopify Theme Kit Get API Access Use a new theme or Configure an existing theme with theme kit Explanation of the above steps are as follows: Install Shopify Theme Kit A...

Shopify • Getting started with Shopify

Get help on available mix tasks

To list available mix tasks use: mix help To get help on a specific task use mix help task e.g.: mix help cmd

Elixir Language • Mix

Installation or Setup

Detailed instructions on getting boto3 set up or installed.

boto3 • Getting started with boto3

Simple HttpClient AuthToken Interceptor (Angular 4.3+)

import { Injectable } from '@angular/core'; import { HttpEvent, HttpHandler, HttpInterceptor, HttpRequest } from '@angular/common/http'; import { UserService } from '../services/user.service'; import { Observable } from 'rxjs/Observable'; @Injectable() export class AuthHeaderInterceptor imple...

Angular 2 • Http Interceptor

HTML Form Events

Events triggered by actions inside a HTML form (applies to almost all HTML elements, but is most used in form elements): AttributeDescriptiononblurFires the moment that the element loses focusonchangeFires the moment when the value of the element is changedoncontextmenuScript to be run when a conte...

HTML • HTML Event Attributes

Keyboard Events

AttributeDescriptiononkeydownFires when a user is pressing a keyonkeypressFires when a user presses a keyonkeyupFires when a user releases a key

HTML • HTML Event Attributes

Finding an object's class

To find whether an object was constructed by a certain constructor or one inheriting from it, you can use the instanceof command: //We want this function to take the sum of the numbers passed to it //It can be called as sum(1, 2, 3) or sum([1, 2, 3]) and should give 6 function sum(...arguments) {...

JavaScript • Datatypes in Javascript

Implementing policy deny rules

It is occasionally desirable to deny a certain Permission to some ProtectionDomain, regardless of any other permissions that domain accrues. This example demonstrates just one of all the possible approaches for satisfying this kind of requirement. It introduces a "negative" permission clas...

Java Language • SecurityManager

Place the user's pin in the map.

Note, if you are not familiar with the google maps api, you may read the precedent example (basics) in order to understand this little example. First, initialize the map. You may add an map's element in your HTML code and a bite of CSS like this: <!DOCTYPE html> <html> <h...

google-maps-api-3 • Getting started with google-maps-api-3

Faster multiplication or division by powers of 2

Shifting bits left (right) is equivalent to multiplying (dividing) by 2. It's the same in base 10: if we "left-shift" 13 by 2 places, we get 1300, or 13 * (10 ** 2). And if we take 12345 and "right-shift" by 3 places and then remove the decimal part, we get 12, or Math.floor(1234...

JavaScript • Bitwise Operators - Real World Examples (snippets)

Instalating Guide JavaFX 8

First of all, I will use Netbeans for this tutorial and this Windows version. Intall Scene Builder: When you have installed Netbeans on your computer, you must install Gluon Scene Builder. Nowadays, Oracle does´t work with Scene Builder and they made it Open Source, to work with the Gluon versi...

javafx-8 • Getting started with javafx-8

Running Thread Safe Code from an Asynchronous Task

Sometimes you'll need to execute synchronous code from within an asynchronous task. To do this, simply schedule a synchronous task from within the asynchronous block. Bukkit.getScheduler().runTaskTimerAsynchronously(VoidFlame.getPlugin(), () -> { Bukkit.getScheduler().runTask(VoidFlame.ge...

bukkit • Scheduler Programming

Add multiple annotation values

An Annotation parameter can accept multiple values if it is defined as an array. For example the standard annotation @SuppressWarnings is defined like this: public @interface SuppressWarnings { String[] value(); } The value parameter is an array of Strings. You can set multiple values by u...

Java Language • Annotations

Set my app as default app for a file type

- (NSString *) UTIforFileExtension:(NSString *) extension { NSString * UTIString = (NSString *)UTTypeCreatePreferredIdentifierForTag(kUTTagClassFilenameExtension, (CFStringRef)extension, ...

osx • File association

Create association with new/custom file types via Info.plist

<key>CFBundleDocumentTypes</key> <array> <dict> <key>CFBundleTypeIconFile</key> <string>Icon file for associated file</string> <key>CFBundleTypeName</key> <string>My file format</string>...

osx • File association

HTML text in UILabel

NSString * htmlString = @"<html><body> <b> Example bold text in HTML </b> </body></html>"; NSAttributedString * attrStr = [[NSAttributedString alloc] initWithData:[htmlString dataUsingEncoding:NSUnicodeStringEncoding] options:@{ NSDocumentTypeDocumentAt...

iOS • attributedText in UILabel

Set different property to text in single UILabel

The first step you need to preform is to create a NSMutableAttributedString object. The reason we create a NSMutableAttributedString instead of NSAttributedString is because it enables us to append string to it. NSString *fullStr = @"Hello World!"; NSMutableAttributedString *attString =[...

iOS • attributedText in UILabel