Tutorial by Examples: ar

List of standard Java Runtime Library functional interfaces by signature

Parameter TypesReturn TypeInterface()voidRunnable()TSupplier()booleanBooleanSupplier()intIntSupplier()longLongSupplier()doubleDoubleSupplier(T)voidConsumer<T>(T)TUnaryOperator<T>(T)RFunction<T,R>(T)booleanPredicate<T>(T)intToIntFunction<T>(T)longToLongFunction<T>(...

Java Language • Functional Interfaces

Getting list of all related children objects in parent's serializer

Assume that, we implement a simple API and we have the following models. class Parent(models.Model): name = models.CharField(max_length=50) class Child(models.Model): parent = models.ForeignKey(Parent) child_name = models.CharField(max_length=80) And we want to return a respo...

django-rest-framework • Serializers

Comparison between Promises and Async/Await

Function using promises: function myAsyncFunction() { return aFunctionThatReturnsAPromise() // doSomething is a sync function .then(result => doSomething(result)) .catch(handleError); } So here is when Async/Await enter in action in order to get clean...

Node.js • Async/Await

Getting started

A-Frame can be developed from a plain HTML file without having to install anything! A great way to try out A-Frame to remix the starter example on Glitch, an online code editor that instantly hosts and deploys for free. Or create an .html file and include A-Frame in the head: <html> <he...

aframe • Getting started with aframe

Writing and Reading from Characteristics

Once you are connected to a Gatt Server, you're going to be interacting with it by writing and reading from the server's characteristics. To do this, first you have to discover what services are available on this server and which characteristics are avaiable in each service: @Override public voi...

Android • Bluetooth Low Energy

Cloning a repository

As it is with GitHub Desktop most of the work is pretty simple: You select "Clone a repository" (In the stable version the plus on the upper left) and there are some repositories (your own and the repos from each company you are in) recommended. Alternatively you can paste a link to any ot...

github • GitHub Desktop

Find Next Tag & Manage Keyboard

The text field calls different delegate methods (only if delegates are set)One of delegate method called by textfield is *- (BOOL)textFieldShouldReturn:(UITextField )textField This method is called whenever users taps the return button.By using this method, we can implement any custom behaviour. ...

iOS • UITextField Delegate

Introduction of Search Engine Optimisation (SEO )

Search engine optimization (SEO for short) is simply the process of obtaining website visitors (or traffic) from “free” or “organic” search results in search engines like Google or Bing. All major search engines have primary search results that are ranked based on what the search engine considers m...

seo • A introduction to SEO

Using Laradock

Laradock is a project that provides a ready to go contains tailored for Laravel use. Download or clone Laradock in your project's root folder: git clone https://github.com/Laradock/laradock.git Change directory into Laradock and generate the .env file needed to run your configurations: cd lara...

Laravel • Laravel Docker

Dropzone in Angular2+

Angular 2 wrapper library for Dropzone. npm install angular2-dropzone-wrapper --save-dev Load the module for your app-module import { DropzoneModule } from 'angular2-dropzone-wrapper'; import { DropzoneConfigInterface } from 'angular2-dropzone-wrapper'; const DROPZONE_CONFIG: DropzoneCon...

dropzone.js • Dropzone in Angular2

Implementing a Leak Canary in Android Application

In your build.gradle you need to add the below dependencies: debugCompile 'com.squareup.leakcanary:leakcanary-android:1.5.1' releaseCompile 'com.squareup.leakcanary:leakcanary-android-no-op:1.5.1' testCompile 'com.squareup.leakcanary:leakcanary-android-no-op:1.5.1' In your Application class yo...

Android • Leakcanary

Actions when a user has started/ended interacting with a textfield

For Swift 3.1: In the first example one can see how you would intercept the user interacting with a textfield while writing. Similarly, there are methods in the UITextFieldDelegate that are called when a user has started and ended his interaction with a TextField. To be able to access these method...

iOS • UITextField Delegate

Check if Array is Initialized (If it contains elements or not).

A common problem might be trying to iterate over Array which has no values in it. For example: Dim myArray() As Integer For i = 0 To UBound(myArray) 'Will result in a "Subscript Out of Range" error To avoid this issue, and to check if an Array contains elements, use this oneliner: If...

excel-vba • Arrays

By assigning property (Passing data forward)

You can pass data directly by assigning the property of the next view controller before you push or present it. class FirstViewController: UIViewController { func openSecondViewController() { // Here we initialize SecondViewController and set the id property to 492 let se...

iOS • Passing Data between View Controllers

Changing a multidimensional array to associative array

If you have a multidimensional array like this: [ ['foo', 'bar'], ['fizz', 'buzz'], ] And you want to change it to an associative array like this: [ 'foo' => 'bar', 'fizz' => 'buzz', ] You can use this code: $multidimensionalArray = [ ['foo', 'bar'], ...

PHP • Processing Multiple Arrays Together

Quick Start

To get started go to root of project directory and run : $ sphinx-quickstart You will get options to create documentation for your project. For default setup follow below commands: Prompt Choice > Root path for the documentation [.]: <ENTER> > Separate source and build dire...

python-sphinx • Getting started with python-sphinx

Xslt Variables

Global Variable: This variable is available everywhere in the xsl stylesheet. This variable should only be the child of <xsl:stylesheet> element. Local variable: This variable is only available where it is declared. See Below Code: <?xml version="1.0" encoding="UTF-8"...

xslt • Variables in xslt

Modify your elasticsearch data

Elasticsearch provides data manipulation & data searching capabilities in almost real time. under this example, we have update, delete & batch processing operations. Updating the same document. Suppose we have already indexed a document on /car/external/1 . Then running the command for i...

Elasticsearch • Learning Elasticsearch with kibana

Iterate Array

You can print the array elements using the loop same as the Java enhanced loop, but you need to change keyword from : to in. val asc = Array(5, { i -> (i * i).toString() }) for(s : String in asc){ println(s); } You can also change data type in for loop. val asc = Array(5, { i -> (i...

Kotlin • Arrays

Run VBS with temporary file(s)

The old-school method for running another script from batch is to echo the script into another location, and then run it. This method can be represented like this: @echo off rem VBS below echo your vbs > TempVBS.vbs echo other vbs>>TempVBS.vbs rem End of VBS cscript //nolog...

batch-file • Batch and VBS hybrids