Tutorial by Examples: nd

Whitespace handling

To remove whitespace (spaces, tabs, newlines…) between HTML tags use spaceless tag: {% spaceless %} <div> <span>foo bar </span> </div> {% endspaceless %} {# produces output <div><strong>foo bar </strong></div> #} If you need ...

twig • Basic template syntax

Page, DOM and Browser loading

This is an example to explain the variations of load events. onload event <body onload="someFunction()"> <img src="image1" /> <img src="image2" /> </body> <script> function someFunction() { console.log("Hi! I am l...

JavaScript • Events

from a public repository using the command line and renaming file

This example grabs the Node.gitignore file from GitHub's gitignore repository, downloads it to your current working directory and renames it to .gitignore - all very typical actions for someone starting a new node.js project. $ curl http://github.com/github/gitignore/raw/master/Node.gitignore -o .g...

github • download single file from GitHub repository

find the url of the file you want to download

navigate to the desired file in a repository click the 'raw' button copy the url from the address bar See the following example from GitHub's gitignore repository: http://github.com/github/gitignore/raw/master/Node.gitignore You can quickly recognize a url that will work to download an indiv...

github • download single file from GitHub repository

Load the Image from Resource from Android Device. Using Intents.

Using Intents to Load the Image from Gallery. Initially you need to have the permission <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/> Use the Following Code to have the layout as designed follows. <?xml version="1.0" enco...

Android • Loading Bitmaps Effectively

AngularJS ng-repeat introduction and challenges

ng-repeat is the built-in directive provided by AngularJS, mostly used for listing the array elements on UI dynamically as per the changes in our model. Official "ng-repeat" docs can be found at : https://docs.angularjs.org/api/ng/directive/ngRepeat Also the most common error faced whil...

angularjs-ng-repeat • Getting started with angularjs-ng-repeat

Cryptographically Secure Random Data

There are times when the framework's Random() class may not be considered random enough, given that it is based on a psuedo-random number generator. The framework's Crypto classes do, however, provide something more robust in the form of RNGCryptoServiceProvider. The following code samples demonstr...

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

Insert values in dynamic SQL

Example below inserts value into the table from the previous example: declare query_text varchar2(1000) := 'insert into my_table(id, column_value) values (:P_ID, :P_VAL)'; id number := 2; value varchar2(100) := 'Bonjour!'; begin execute immediate query_text using id, value; end; / ...

Oracle Database • Dynamic SQL

Update values in dynamic SQL

Let's update table from the first example: declare query_text varchar2(1000) := 'update my_table set column_value = :P_VAL where id = :P_ID'; id number := 2; value varchar2(100) := 'Bonjour le monde!'; begin execute immediate query_text using value, id; end; /

Oracle Database • Dynamic SQL

Commanding in MVVM

Commands are used for handling Events in WPF while respecting the MVVM-Pattern. A normal EventHandler would look like this (located in Code-Behind): public MainWindow() { _dataGrid.CollectionChanged += DataGrid_CollectionChanged; } private void DataGrid_CollectionChanged(object sender, S...

wpf • MVVM in WPF

Hello World in a SFML Window

Let's write a small program which will open a window, and write "Hello World" on the screen. #include <SFML\Graphics.hpp> #include <cassert> int main() { sf::RenderWindow sfmlWin(sf::VideoMode(600, 360), "Hello World SFML Window"); sf::Font font; /...

sfml • Getting started with sfml

Setup environment variable in ASP.NET Core [Windows]

=> Original Post <= ASP.NET Core uses the ASPNETCORE_ENVIRONMENT environment variable to determine the current environment. By default, if you run your application without setting this value, it will automatically default to the Production environment. > dotnet run Project TestApp (.NETC...

asp.net-core • Getting started with asp.net-core

Apply Filter to Image Patches and Set Each Pixel as the Mean of the Result of Each Patch

Many modern Image Processing algorithms use patches are their basic element to work on. For instance one could denoise patches (See BM3D Algorithm). Yet when building the image form the processed patches we have many results for the same pixel. One way to deal with it is taking the average (Empir...

MATLAB Language • Usage of `accumarray()` Function

Recommended ways to execute shell code in Ruby:

Open3.popen3 or Open3.capture3: Open3 actually just uses Ruby's spawn command, but gives you a much better API. Open3.popen3 Popen3 runs in a sub-process and returns stdin, stdout, stderr and wait_thr. require 'open3' stdin, stdout, stderr, wait_thr = Open3.popen3("sleep 5s && ls&q...

Ruby Language • Operating System or Shell commands

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

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

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

Delete local branches that have been deleted on the remote

To remote tracking between local and deleted remote branches use git fetch -p you can then use git branch -vv to see which branches are no longer being tracked. Branches that are no longer being tracked will be in the form below, containing 'gone' branch 12345e6 [origin/bran...

Git • Tidying up your local and remote repository

Create and push tag(s) in GIT

Create a tag: To create a tag on your current branch: git tag < tagname > This will create a local tag with the current state of the branch you are on. To create a tag with some commit: git tag tag-name commit-identifier This will create a local tag with the commit-identifier...

Git • Git Tagging