Small Overview about JEST ?

What is Jest?

Jest is an open JavaScript testing library from Facebook. Its slogan is "Delightful JavaScript Testing". While Jest can be used to test any JavaScript library, it shines when it comes to React and React Native.

Main Benefits

1) Developer Ready

Complete and ready to set-up JavaScript testing solution. Works out of the box for any React project.

2) Instant Feedback

Fast interactive watch mode runs only test files related to changed files and is optimized to give signal quickly.

3) Snapshot Testing

Capture snapshots of React trees or other serializable values to simplify testing and to analyze how state changes over time.

Jest is used by Facebook to test all JavaScript code including React applications. One of Jest's philosophies is to provide an integrated "zero-configuration" experience.

NPM and Yarn Command for Installation.

npm install --save-dev jest

yarn add --dev jest

Video for JEST Library

Small Overview About DevExterme.Js?

What is DevExterme.Js?

A Feature-Complete HTML5 JavaScript Data Grid Widget. The blazing-fast DevExtreme HTML5 Data Grid is a feature-rich data shaping and editing client-side widget which allows your end users to easily manage information and display it on-screen as business requirements dictate.

DevExtreme can be used with different technologies and supports deep integration with client-side libraries.

They are

JQuery
Angular
React
Asp.Net MVC
Knockout
Angular.Js

Getting Started
After installation, you can add a widget to your app. Here's a simple button example:

<div id="buttonContainer"></div>
var element = document.getElementById('buttonContainer');
var button = new DevExpress.ui.dxButton(element, { text: 'Hello World!' });

Video for DevExterme.JS?

https://www.youtube.com/watch?v=KJpS2Iwrrg8

Small Overview about amCharts.js?

What is AmCharts?

amCharts is a company based in Vilnius, Lithuania. The beginning of amCharts and amMap was in 2004, when the first version of amMap was made. Antanas Marcelionis worked as a manager in a web development company and, being a fan of maps and traveling, wanted to have a tool which would work like a pin-map for him.

Easily add charting capabilities to your websites and applications. Compatible with all modern and most legacy browsers (yes even IE7), JavaScript Charts allows creating flexible Pie, Column, Line, and number of other chart types.

Features

Advanced serial charts
Superior time-based scales
Micro-charts and sparklines
Responsive
Mobile Friendly
Accessible

Video for amCharts

https://www.youtube.com/watch?v=7RmwtoiEWkw

Small overview about MemcacheDB?

What is MemcacheDB ?

MemcacheDB is a distributed key-value storage system designed for persistent. It is NOT a cache solution, but a persistent storage engine for fast and reliable key-value based object storage and retrieval. It conforms to memcache protocol(not completed, see below), so any memcached client can have connectivity with it. MemcacheDB uses Berkeley DB as a storing backend, so lots of features including transaction and replication are supported.

Free & open source, high-performance, distributed memory object caching system, generic in nature, but intended for use in speeding up dynamic web applications by alleviating database load.

Memcached is an in-memory key-value store for small chunks of arbitrary data (strings, objects) from results of database calls, API calls, or page rendering.

Memcached is simple yet powerful. Its simple design promotes quick deployment, ease of development, and solves many problems facing large data caches. Its API is available for most popular languages.

MemcacheDB is compatible with memcache protocol, so any clients that support memcache protocol have connectivity with it.

MemcacheDB Commands supports:

get(also mutiple get)
set, add, replace
append/prepend
incr, decr
delete
stats

A version of MemcacheDB using Lightning Memory-Mapped Database (LMDB) is also available, offering greater performance. MemcacheDB is accessed through the same protocol as memcached, so applications may use any memcached API as a means of accessing a MemcacheDB database.

MemcacheQ is a MemcacheDB variant that provides a simple message queue service.

Video for Memcache DB

https://www.youtube.com/watch?v=1u3Y7qB9ACM

Small overview about Scylla?

What is Scylla?

Scylla is an open-source distributed NoSQL data store. It was designed to be compatible with Apache Cassandra while achieving significantly higher throughputs and lower latencies. It supports the same protocols as Cassandra (CQL and Thrift) and the same file formats (SSTable), but is a completely rewritten implementation, using the C++14 language replacing Cassandra's Java, and the Seastar asynchronous programming library replacing threads, shared memory, mapped files, and other classic Linux programming techniques.

Scylla uses a shared design on each node, meaning that each CPU core handles a different subset of data. Cores do not share data, but rather communicate explicitly when they need to. The Scylla authors claim that this design allows Scylla to achieve much better performance on modern NUMA SMP machines, and to scale very well with the number of cores. They have measured as much as 2 million requests per second on a single machine, and also claim that a Scylla cluster can serve as many requests as a Cassandra cluster 10 times its size - and do so with lower latencies.

Benefits

Low and Consistent Latency
Always-On Availability
10x Higher Throughput
Highly Scalable
Easy to Use
Community Backed
Compaction, Streaming and Repair Solved
Optimum Total Cost of Ownership
Auto Tuning

Video for Scylla

https://www.youtube.com/watch?v=URTyQIsXkJs

Small Overview about Koa.js?

What is Koa.Js?

Koa.js is a JavaScript web application framework that's brought some pretty important changes to the development of middleware—a key layer of software in web applications that keeps everything in a network linked and running smoothly.

Koa.js is a minimal and flexible Node.js web application framework that provides a robust set of features for web and mobile applications. It is an open source framework developed and maintained by the creaters of Express.js, the most popular node web framework.

npm install koa

Koa provides a Request object as the request property of the Context.
Koa's Request object provides helpful methods for working with http requests which delegate to an IncomingMessage from the node http module.

Video for Koa.JS

https://www.youtube.com/watch?v=z6ihthEwXDk

Small Overview About Argon.Js?

What is Argon.Js?

Argon.js is a javascript framework for adding augmented reality content to web applications

Augmented reality (AR) is the idea of mixing computer-generated media (e.g., 3D objects, 2D content, spatialized audio) with someone’s view of the real world. Whether you want to create a new AR application, or add an AR view to an existing web application, the argon.js framework provides a set of abstractions and utilities for adding an AR view to your web application in a platform- and technology-independent way.

Argon.js was originally designed to take advantage of the augmented reality capabilities of the Argon AR-enabled web browser on iOS, simplifying the process of delivering mobile AR experiences without the need to create, ship and support native applications.

However, argon.js will also work with other web browsers, taking advantage of their capabilities to allow your application to deliver whatever kind of AR experience each browser is capable of. While the AR capabilities a most web browsers is currently minimal, they are improving rapidly, and argon.js is designed to support this evolution.

Npm Command

npm install @argonjs/argon@^1.0

Video for Argon.Js

https://www.youtube.com/watch?v=F_M8C2jW8PI

Small Overview about Slick Slider.Js?

What is Slick?

Slick is a fresh new jQuery plugin for creating fully customizable, responsive and mobile friendly carousels/sliders that work with any html elements.

Features:

Fully responsive. Scales with its container.
Separate settings per breakpoint
Uses CSS3 when available. Fully functional when not.
Swipe enabled. Or disabled, if you prefer.
Desktop mouse dragging
Infinite looping.
Fully accessible with arrow key navigation
Add, remove, filter & unfilter slides
Autoplay, dots, arrows, callbacks, etc...

# Bower

bower install --save slick-carousel

# NPM

npm install slick-carousel

In slick 1.5 you can now add settings using the data-slick attribute. You still need to call $(element).slick() to initialize slick on the element.

Example

<div data-slick='{"slidesToShow": 4, "slidesToScroll": 4}'>
<div><h3>1</h3></div>
<div><h3>2</h3></div>
<div><h3>3</h3></div>
<div><h3>4</h3></div>
<div><h3>5</h3></div>
<div><h3>6</h3></div>
</div>

Video for Slick Slider
https://www.youtube.com/watch?v=c9pID1dWON4

Small Overview about JEST ?

References

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