Getting started with Ember.js in 2020

JavaScript, one of the core technologies that powers the web, has evolved over the years. Originally intended to be just a client-side scripting language, it has now grown to be a mature language and with its growth, we’ve seen the rise and fall of many libraries and frameworks over the years.

In this article, we will take a look at one of JavaScript’s oldest frontend frameworks, Ember.js. We will explore the core concepts and see how to get started using it.

What is Ember?

Built by Yehuda Katz and Tom Dale in 2011, Ember.js is an opensource JavaScript framework, it is popularly known as the framework for building ambitious applications and commonly referred to as the “together framework” due to its close-knit community. It is a framework best suited to building large scale client-side applications.

Its official website describes Ember as :

A productive, battle-tested JavaScript framework for building modern web applications. It includes everything you need to build rich UIs that work on any device.

Prerequisites

This tutorial assumes the reader has the following:

• Node.js 10x or higher
• Yarn / npm 5.2 or higher installed on their PC
• Basic knowledge of JavaScript and how frameworks work

Basic usage

Install the ember-cli tool, this toolkit is for Ember.js that helps you bootstrap Ember projects on the fly.

Install the CLI tool with the following command:

npm install -g ember-cli

Installing the Ember CLI package globally gives us access to the ember command in our terminal, the ember new command helps us create a new application.

Next, create an ember project with the new command:

ember new ember-quickstart

This command will create a new directory called ember-quickstart and set up a new Ember application with all the necessary files and configurations for bootstrapping a project inside of it.

Change directory into the application directory:

cd ember-quickstart

start the development server:

ember serve

You should get something similar to this running on [http://localhost:4200](http://localhost:8080/) after running the ember serve command.

Understanding the Ember directory structure and architecture

Core concepts

The Ember.js is an MVC-based framework, it follows a uni-directional data flow pattern popularly know as Data Down Actions Up (DDAU) which was influenced by the Flux architectural pattern created by Facebook and uses Glimmer VM for rendering and updating the DOM, Glimmer is a virtual machine that compiles the handlebars templates code into bytecode herby delivering a faster experience., it parses the bytecode and renders the view to users.

Having an understanding of the following concepts in Ember is important.

Models

Models are objects used to store and maintain data used in our application, The data can be retrieved with Ember Data a library for robustly managing data in applications. The Ember Data library is included by default in our Ember CLI scaffold.

Controllers

Controllers are wrappers around the model, they act as the intermediary between the views and models. They are used to retrieve, update and modify data in the model. Data requests to the models are performed by the controller.

Templates

Templates represent the view layer in MVC, they are the interface used to render data to users. Templates are built with handlebars templating language.

Routing

Routing is managed by the Router file, it maps a route to a route handler stored in the /routes folder, The router is responsible for rendering contents created using a template to the user.

Components

Components are reusable collections of UI elements that contain markup, logic, and styling. They are the building block for an application.

Directory structure

A new Ember project is structured similarly to this:

├── app
│   ├── app.js
│   ├── components
│   ├── controllers
│   ├── helpers
│   ├── index.html
│   ├── models
│   ├── router.js
│   ├── routes
│   ├── styles
│   │   └── app.css
│   └── templates
│       └── application.hbs
├── config
│   ├── environment.js
│   ├── optional-features.json
│   └── targets.js
├── ember-cli-build.js
├── package.json
├── package-lock.json
├── public
│   └── robots.txt
├── README.md
├── testem.js
├── tests
│   ├── helpers
│   ├── index.html
│   ├── integration
│   ├── test-helper.js
│   └── unit
└── vendor

Files and directories

Let’s take time to understand what the files and folder represent and how we can use them.

• package.json — contains information about your project like which dependencies are installed in your project and scripts that can be run
• /app — this folder houses the core code of your application. It contains critical parts of your application such as components, templates, models, routes, and styles. You’d mostly be working with files in this directory
  • app.js — this is the main application file. It is the apps entry point
  • /templates — this folder houses handlebars templates, these templates are compiled to /dist folder during build
  • /controllers — this folder contains your controllers, a controller is where you define data binding to variables on your templates
  • /helpers — this folder contains helper functions used in your handlebar templates. Helper functions are JavaScript functions that add additional functionalities to your templates beyond what is included out-of-the-box in Ember
  • /index.html — the app/index.html file lays the foundation for the Ember application. This is where the basic DOM structure is laid out, the title attribute is set, and stylesheet/JavaScript includes are done
  • /models — this directory is where your models are created, models are objects that represent the underlying data in your application. They are used to store and maintain data used in our application
  • /router.js — this file houses the applications route configurations. The routes defined here correspond to routes in /routes folder
  • /routes — this folder contains route handler files, which sets up what should happen when a route is loaded
• ember-cli-build.js — this file describes how Ember CLI should build our app
• testem.js — Ember CLI’s test runner Testem is configured in testem.js
• /public — this directory will be copied to the dist directory during build, use this for assets that don’t have a build step, such as images or fonts
• /vendor — this directory is where frontend dependencies (such as JavaScript or CSS) that are not managed by npm go
• /tests — The tests directory contains your automated tests, as well as various helpers to load and run the tests. QUnit is the default testing framework for Ember
• /config — The config directory contains your application’s configuration files, environment, and browser build settings

Why developers love Ember

Ember.js gets lots of love from developers who make use of it for several reasons, some include:

• Convention over configuration — one of the many reasons developers like Ember is the fact that it prioritizes convention over configuration. Convention over configuration, championed by David Heinemeier Hansson (creator of Rails framework) is a software design paradigm that attempts to decrease the number of decisions that a developer using a framework is required to make without necessarily losing flexibility. This means developers don’t have to worry about the right thing to do or the right architecture as the framework makes these decisions
• Tight-knit community — the Ember community is also one of the things that is appealing for many with over 2,000 addons, the community also prioritize coming up with a standard way to do things instead of having people do things differently
• It’s a Swiss army knife — it comes pre-configured with almost all you need to get an application up and running
• Stability without stagnation — it has backwards compatibility
• Early adoption — the adoption of latest web standards and the latest JavaScript language feature

The pros and cons of using Ember

Pros

• Community
• Everything comes out of the box
• Detailed documentation and resources
• Early adoption of the JavaScript language features
• Glimmer VM makes compilation ridiculously fast

Cons

• Size — it is quite large
• Learning curve — it has a steep learning curve
• Rigidity — no room for exploration
• Many tutorials are outdated

Conclusion

In this article we’ve seen what Ember.js is, we’ve learned its core concepts and how to get started with using it.

The Ember.js framework has come a long way and has tons of guides and tutorials to help onboard new users of the framework, Check this tutorial made for people coming from other frameworks(it includes Vue and React) also the documentation is quite robust and explains concepts in-depth. The best part about Ember is the community – they have a discord group, their discussion forum is quite helpful, and the Dev.to feed is quite resourceful.

Is it worth learning?

Except specifically needed for a job, I think it is quite unnecessary to learn it given its steep learning curve except obviously you’re doing so just for curiosity.

The low skill-demand rate also suggests that one might be better off using the newer and shiny libraries/framework such as React, Vue, or Svelte.

Originally published by Anjolaoluwa Adebayo-Oyetoro at https://blog.logrocket.com

#javascript #ember #webdev #reactjs #angular

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Citrix Bugs Allow Unauthenticated Code Injection, Data Theft

Multiple vulnerabilities in the Citrix Application Delivery Controller (ADC) and Gateway would allow code injection, information disclosure and denial of service, the networking vendor announced Tuesday. Four of the bugs are exploitable by an unauthenticated, remote attacker.

The Citrix products (formerly known as NetScaler ADC and Gateway) are used for application-aware traffic management and secure remote access, respectively, and are installed in at least 80,000 companies in 158 countries, according to a December assessment from Positive Technologies.

Other flaws announced Tuesday also affect Citrix SD-WAN WANOP appliances, models 4000-WO, 4100-WO, 5000-WO and 5100-WO.

Attacks on the management interface of the products could result in system compromise by an unauthenticated user on the management network; or system compromise through cross-site scripting (XSS). Attackers could also create a download link for the device which, if downloaded and then executed by an unauthenticated user on the management network, could result in the compromise of a local computer.

“Customers who have configured their systems in accordance with Citrix recommendations [i.e., to have this interface separated from the network and protected by a firewall] have significantly reduced their risk from attacks to the management interface,” according to the vendor.

Threat actors could also mount attacks on Virtual IPs (VIPs). VIPs, among other things, are used to provide users with a unique IP address for communicating with network resources for applications that do not allow multiple connections or users from the same IP address.

The VIP attacks include denial of service against either the Gateway or Authentication virtual servers by an unauthenticated user; or remote port scanning of the internal network by an authenticated Citrix Gateway user.

“Attackers can only discern whether a TLS connection is possible with the port and cannot communicate further with the end devices,” according to the critical Citrix advisory. “Customers who have not enabled either the Gateway or Authentication virtual servers are not at risk from attacks that are applicable to those servers. Other virtual servers e.g. load balancing and content switching virtual servers are not affected by these issues.”

A final vulnerability has been found in Citrix Gateway Plug-in for Linux that would allow a local logged-on user of a Linux system with that plug-in installed to elevate their privileges to an administrator account on that computer, the company said.

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Best Electric Bikes and Scooters for Rental Business or Campus Facility

The electric scooter revolution has caught on super-fast taking many cities across the globe by storm. eScooters, a renovated version of old-school scooters now turned into electric vehicles are an environmentally friendly solution to current on-demand commute problems. They work on engines, like cars, enabling short traveling distances without hassle. The result is that these groundbreaking electric machines can now provide faster transport for less — cheaper than Uber and faster than Metro.

Since they are durable, fast, easy to operate and maintain, and are more convenient to park compared to four-wheelers, the eScooters trend has and continues to spike interest as a promising growth area. Several companies and universities are increasingly setting up shop to provide eScooter services realizing a would-be profitable business model and a ready customer base that is university students or residents in need of faster and cheap travel going about their business in school, town, and other surrounding areas.

Electric Scooters Trends and Statistics

In many countries including the U.S., Canada, Mexico, U.K., Germany, France, China, Japan, India, Brazil and Mexico and more, a growing number of eScooter users both locals and tourists can now be seen effortlessly passing lines of drivers stuck in the endless and unmoving traffic.

A recent report by McKinsey revealed that the E-Scooter industry will be worth― $200 billion to $300 billion in the United States, $100 billion to $150 billion in Europe, and $30 billion to $50 billion in China in 2030. The e-Scooter revenue model will also spike and is projected to rise by more than 20% amounting to approximately $5 billion.

And, with a necessity to move people away from high carbon prints, traffic and congestion issues brought about by car-centric transport systems in cities, more and more city planners are developing more bike/scooter lanes and adopting zero-emission plans. This is the force behind the booming electric scooter market and the numbers will only go higher and higher.

Companies that have taken advantage of the growing eScooter trend develop an appthat allows them to provide efficient eScooter services. Such an app enables them to be able to locate bike pick-up and drop points through fully integrated google maps.

List of Best Electric Bikes for Rental Business or Campus Facility 2020:

It’s clear that e scooters will increasingly become more common and the e-scooter business model will continue to grab the attention of manufacturers, investors, entrepreneurs. All this should go ahead with a quest to know what are some of the best electric bikes in the market especially for anyone who would want to get started in the electric bikes/scooters rental business.

We have done a comprehensive list of the best electric bikes! Each bike has been reviewed in depth and includes a full list of specs and a photo.

Billy eBike

 https://www.kickstarter.com/projects/enkicycles/billy-were-redefining-joyrides

To start us off is the Billy eBike, a powerful go-anywhere urban electric bike that’s specially designed to offer an exciting ride like no other whether you want to ride to the grocery store, cafe, work or school. The Billy eBike comes in 4 color options – Billy Blue, Polished aluminium, Artic white, and Stealth black.

Price: $2490

Available countries

Available in the USA, Europe, Asia, South Africa and Australia.This item ships from the USA. Buyers are therefore responsible for any taxes and/or customs duties incurred once it arrives in your country.

Features

• Control – Ride with confidence with our ultra-wide BMX bars and a hyper-responsive twist throttle.
• Stealth- Ride like a ninja with our Gates carbon drive that’s as smooth as butter and maintenance-free.
• Drive – Ride further with our high torque fat bike motor, giving a better climbing performance.
• Accelerate – Ride quicker with our 20-inch lightweight cutout rims for improved acceleration.
• Customize – Ride your own way with 5 levels of power control. Each level determines power and speed.
• Flickable – Ride harder with our BMX /MotoX inspired geometry and lightweight aluminum package

Specifications

• Maximum speed: 20 mph (32 km/h)
• Range per charge: 41 miles (66 km)
• Maximum Power: 500W
• Motor type: Fat Bike Motor: Bafang RM G060.500.DC
• Load capacity: 300lbs (136kg)
• Battery type: 13.6Ah Samsung lithium-ion,
• Battery capacity: On/off-bike charging available
• Weight: w/o batt. 48.5lbs (22kg), w/ batt. 54lbs (24.5kg)
• Front Suspension: Fully adjustable air shock, preload/compression damping /lockout
• Rear Suspension: spring, preload adjustment
• Built-in GPS

Why Should You Buy This?

• Riding fun and excitement
• Better climbing ability and faster acceleration.
• Ride with confidence
• Billy folds for convenient storage and transportation.
• Shorty levers connect to disc brakes ensuring you stop on a dime
• belt drives are maintenance-free and clean (no oil or lubrication needed)

**Who Should Ride Billy? **

Both new and experienced riders

**Where to Buy? **Local distributors or ships from the USA.

Genze 200 series e-Bike

 https://www.genze.com/fleet/

Featuring a sleek and lightweight aluminum frame design, the 200-Series ebike takes your riding experience to greater heights. Available in both black and white this ebike comes with a connected app, which allows you to plan activities, map distances and routes while also allowing connections with fellow riders.

Price: $2099.00

Available countries

The Genze 200 series e-Bike is available at GenZe retail locations across the U.S or online via GenZe.com website. Customers from outside the US can ship the product while incurring the relevant charges.

Features

• 2 Frame Options
• 2 Sizes
• Integrated/Removable Battery
• Throttle and Pedal Assist Ride Modes
• Integrated LCD Display
• Connected App
• 24 month warranty
• GPS navigation
• Bluetooth connectivity

Specifications

• Maximum speed: 20 mph with throttle
• Range per charge: 15-18 miles w/ throttle and 30-50 miles w/ pedal assist
• Charging time: 3.5 hours
• Motor type: Brushless Rear Hub Motor
• Gears: Microshift Thumb Shifter
• Battery type: Removable Samsung 36V, 9.6AH Li-Ion battery pack
• Battery capacity: 36V and 350 Wh
• Weight: 46 pounds
• Derailleur: 8-speed Shimano
• Brakes: Dual classic
• Wheels: 26 x 20 inches
• Frame: 16, and 18 inches
• Operating Mode: Analog mode 5 levels of Pedal Assist Thrott­le Mode

Norco from eBikestore

 https://ebikestore.com/shop/norco-vlt-s2/

The Norco VLT S2 is a front suspension e-Bike with solid components alongside the reliable Bosch Performance Line Power systems that offer precise pedal assistance during any riding situation.

Price: $2,699.00

Available countries

This item is available via the various Norco bikes international distributors.

Features

• VLT aluminum frame- for stiffness and wheel security.
• Bosch e-bike system – for their reliability and performance.
• E-bike components – for added durability.
• Hydraulic disc brakes – offer riders more stopping power for safety and control at higher speeds.
• Practical design features – to add convenience and versatility.

Specifications

• Maximum speed: KMC X9 9spd
• Motor type: Bosch Active Line
• Gears: Shimano Altus RD-M2000, SGS, 9 Speed
• Battery type: Power Pack 400
• Battery capacity: 396Wh
• Suspension: SR Suntour suspension fork
• Frame: Norco VLT, Aluminum, 12x142mm TA Dropouts

Bodo EV

http://www.bodoevs.com/bodoev/products_show.asp?product_id=13

Manufactured by Bodo Vehicle Group Limited, the Bodo EV is specially designed for strong power and extraordinary long service to facilitate super amazing rides. The Bodo Vehicle Company is a striking top in electric vehicles brand field in China and across the globe. Their Bodo EV will no doubt provide your riders with high-level riding satisfaction owing to its high-quality design, strength, breaking stability and speed.

Price: $799

Available countries

This item ships from China with buyers bearing the shipping costs and other variables prior to delivery.

Features

• Reliable
• Environment friendly
• Comfortable riding
• Fashionable
• Economical
• Durable – long service life
• Braking stability
• LED lighting technology

Specifications

• Maximum speed: 45km/h
• Range per charge: 50km per person
• Charging time: 8 hours
• Maximum Power: 3000W
• Motor type: Brushless DC Motor
• Load capacity: 100kg
• Battery type: Lead-acid battery
• Battery capacity: 60V 20AH
• Weight: w/o battery 47kg

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Difference between AngularJS, React, Ember, Backbone, and Node.js.

The most common thing between all of them is that they are Single Page Apps. The SPA is a single page where much of the information remains the same and only some piece of data gets modified when you click on other categories/option.

#angular-js #node-js #ember-js #backbone-js

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