Tutorial by Examples: p

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

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)

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

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

Spring Boot and Spring Data Elasticsearch integration

In this example we are going to implement spring-data-elasticsearch project to store POJO in elasticsearch. We will see a sample maven project which does the followings: Insert a Greeting(id, username, message) item on elasticsearch. Get All Greeting items which have been inserted. Update a Gr...

spring-boot • Spring Boot + Spring Data Elasticsearch

Spring boot and spring data elasticsearch integration

In this example we are going to see a maven based spring boot application which integrates spring-data-elasticsearch. Here, we will do the followings and see the respective code segments. Insert a Greeting(id, username, message) item on elasticsearch. Get all items from elasticsearch Update a s...

spring-boot • Spring Boot + Spring Data Elasticsearch

How to integrate with Stripe

Add Stripe gem to our Gemfile gem 'stripe' Add initializers/stripe.rb file. This file contains the necessary keys for connecting with your stripe account. require 'require_all' Rails.configuration.stripe = { :publishable_key => ENV['STRIPE_PUBLISHABLE_KEY'], :secret_key =&g...

Ruby on Rails • Payment feature in rails

Applying a system font to a TextView

In the following code you need to replace fontsname by the name of the font you would like to use: TextView lblexample = (TextView) findViewById(R.id.lblexample); lblexample.setTypeface(Typeface.createFromFile("/system/fonts/" + "fontsname" + ".ttf"));

Android • Getting system font names and using the fonts

Installation or Setup

Detailed instructions on getting magento-1.9 set up or installed.

magento-1.9 • Getting started with magento-1.9

Secure express.js 3 Application

The configuration to make a secure connection using express.js (Since version 3): var fs = require('fs'); var http = require('http'); var https = require('https'); var privateKey = fs.readFileSync('sslcert/server.key', 'utf8'); var certificate = fs.readFileSync('sslcert/server.crt', 'utf8'); ...

Node.js • Securing Node.js applications

Docker and docker-compose

First of all, we will need to create our Dockerfile. A good example can be found on this blog by Nick Janetakis. This code contains the script that will be executed on our docker machine at the moment of start.For this reason, we are installing all the required libraries and ends with the start of ...

Ruby on Rails • Rails on docker