Tutorial by Examples: r

Installation or Setup

Detailed instructions on getting symfony-forms set up or installed.

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...

Linking Electron with Bootstrap

In order to use bootstrap, there are 2 cases. The electron app is connected to internet The electron app is not connected to internet For electron apps that are connected to internet, we can just make use of CDN links for bootstrap and include that in our html files. The problem comes when w...

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...

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...

Using printf to decode a string

#!bin/bash $ string='Question%20-%20%22how%20do%20I%20decode%20a%20percent%20encoded%20string%3F%22%0AAnswer%20%20%20-%20Use%20printf%20%3A)' $ printf '%b\n' "${string//%/\\x}" # the result Question - "how do I decode a percent encoded string?" Answer - Use printf ...

Installation or Setup

Detailed instructions on getting metal set up or installed.

Delegate Can be used as a layer to reduce boilerplate

Consider Kotlin's Null Type system and WeakReference<T>. So let's say we have to save some sort of reference and we wanted to avoid memory leaks, here is where WeakReference comes in. take for example this: class MyMemoryExpensiveClass { companion object { var reference: WeakR...

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...

create the new controller with name API

<?php defined('BASEPATH') OR exit('No direct script access allowed'); class Api extends CI_Controller { //default value private $login_credential; function __construct() { parent::__construct(); //for user authentication $this->load->library('session'); ...

Retrieve some data from API add following function in API controller

/***************************** @return all events ****************************/ public function getallevents(){ //get data from model $events = array( array('Event 1', '2015-04-03'), array('Event 2', '2015-04-03'), array('Event 3', '2015-06-16'), array('Event 4', '2015-0...

log in user API for allow access of some private data for perticular user

/***************************** login user @required : username and password via post method only @return user data if login successfull otherwise error message ****************************/ public function login(){ $username=$this->input->post('username'); $password=$this->input-...

user log out api to destroy the session of loged in user

/*************************** log out user ***************************/ public function logout(){ //delete all session session_destroy(); $this->output->set_output(json_encode(array('status'=>true,'msg'=>'log Out successfully'))); }

create protected api

This API not accessible for public user, authentication is required /*************************** this is protected api this is not accessible if you are not loged in ***************************/ public function protectedapi(){ if($this->session->userdata('logged_in')){ //this secti...

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...

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...

Overview

Suppose you have an E-commerce cloud having various Microservices as shopping cart service, Order service, Inventory service and so on. You need to have an API gateway as an Edge service to the outer world. The API gateway abstracts the details(host & port) about the underline Microservices. ...

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; / ...

Connecting electron app with Nedb

While building electron apps, usually the backend is in separate folder (js files) and front end is in a separate folder (html files). In the backend, in order to use the database, we have to include the nedb package with the require statement as follows. var Datastore = require('nedb'),db = new Da...

Insert Data in nedb

Basically, in order to insert records to nedb, the data is stored in the form of json with the key being the column names and the value for those names will be the values for that record. var rec = { name: 'bigbounty',age:16}; db.insert(rec, function (err, newrec) { // Callback is optional ...

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