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The
Ionic project is rapidly gaining in popularity. With more than 27,000
stars on GitHub, it has risen to become one of the top 50 most popular
open source projects worldwide. And Team Linkites working with Ionic 1 & Ionic 2. for more information click here –>>Building mobile apps with ionic 2 (ionic 1 vs ionic 2 performance).
And since the stable version of Ionic 2 was recently announced, it’s the perfect time for engineers to analyze and understand the differences between Ionic 2 and Ionic 1.
At
a high level, Ionic 2 is a complete rewrite of the Ionic 1 project with
Angular >= 2.x. From my 2+ years of experience using Ionic 1, here’s
what this will mean in practical terms.
Ionic
1 is based on Angular 1.x, and Ionic 2 is based on Angular >= 2.x.
The performance boost you get just by using Angular >= 2.x alone is
significant.
With Angular 1.x, to get performant applications required a lot of deep framework knowledge (like $watch, One-time binding, and so on). With Angular >= 2.,x applications are pretty much performant out of the box.
The
new version of Angular dropped the famous and decried digest cycle
(tracking and testing every variable of the app at every change).
Instead, Angular >= 2.x relies on Zone.js to track application changes (both synchronous and asynchronous).
Change Detection in Angular >= 2.x
is worth exploring to understand how things work under the hood. In
Angular >= 2.x, change detection is always performed from top to
bottom. Using the right change detection strategy (OnPush or Default) in your own components is of paramount importance if you want to control the performance of your application.
All Ionic 2 components use the OnPush
strategy, meaning the change detection is not performed all the time
but, instead, only when the inputs change. This strategy also avoids
unnecessary rendering of components’ subtrees. It is basically already
optimized for you.
If you want to know more about how to get a performant Ionic1 application, I suggest reading this Ultimate AngularJS and Ionic performance cheat sheet.
Faster DOM Performance
Angular
Document Object Model (DOM) manipulation has evolved a lot. If you want
a reactive User Interface (UI), DOM manipulation and JavaScript performance is important.
For
example, creating 1,000 rows in a table takes 126 milliseconds with
vanilla JavaScript, 110% more (264ms) with Angular. 1.x, and only 40%
more (177ms) with Angular >= 2. As you can see, the performance of
Angular >= 2.x is better than Angular 1.x, and is similar to React
performance.
Ionic 2, once again, benefits from this performance upgrade, and does so “for free”.
The New Web Animations API
Ionic
1 and Ionic 2 still rely on CSS animations for internal transitions and
animations, but as Ionic 2 is based on Angular >= 2.x, developers
have access to the new Web Animations (W3C) API via the Angular animation system.
The Web Animations API is a JavaScript API that provides developers with access to the browser’s animation engine. It is not supported in all the browsers yet, but with a polyfill you can use it right now and enjoy one of the most performant and promising ways to animate the Web.
Building mobile apps with ionic 2Source
The
Angular >= 2.x animation API lets you easily describe complex
animations (entering and leaving from different states or group
animations) and gives you access to animations lifecycle via callbacks.
Native scrolling allows Ionic 2 to listen to scrolling events on supported WebViews. It makes Pull to Refresh, List Reordering, or Infinite Scroll possible without emulating those events (JavaScript scrolling).
Ionic 2(Android apps, iPhone apps, Window apps)
Until now, JavaScript scrolling was necessary, but Chromium (Android) and WKWebView (iOS)
WebViews have evolved and now support native scrolling. It is only
enabled by default on Android with Ionic 1 (since December 2015) and
enabled on all platforms with Ionic 2.
Native scrolling support
brings better performance and improves the user experience by helping to
ensure a smooth scroll thanks to asynchronous events.
For more info click here>> Building mobile apps with ionic 2
Improved Components API
Ionic 2 gives you access to all the components that made Ionic 1 famous, but are now improved and based on Angular >= 2.x. Here is the list of the most common components:
Button
Card
Icon
List
Menu
Modal
Toolbar
The components API changed a bit between Ionic 1 and Ionic 2. For instance, Ionic 1 ion-spinner components use icon attribute for the spinner type:
<ion-spinnericon="bubbles"></ion-spinner>
Whereas Ionic 2 uses the name attribute:
<ion-spinnername="bubbles"></ion-spinner>
As you can see, if you are familiar with the Ionic 1
component API, you will feel comfortable using Ionic 2 components as
well. You’ll just need to be aware of these differences.
With an impressive list of components, everything that you can do with Ionic 1 is doable with Ionic 2, and even more.
Introduction of Web Workers
Web Workers
allow your application to run scripts in background JavaScript threads.
Workers can perform tedious tasks and HTTP requests outside of your
application context (i.e., without interfering with the user interface).
Today, Web Workers are supported by all major browsers.
Traditionally, all frameworks were built on top of, and relied on, the window and document objects. However, in workers neither are available. With the new Angular >=2 architecture that decoupled the renderer, running the application within Web Workers (or any other platform for that matter) is made easier.
Ionic 2 is starting to experiment with the use of Web Workers with the new ion-imgcomponent. For now, ion-img can only be used within a VirtualScroll
list. It delegates the image HTTP call to the Web Workers, and also
supports lazy loading (i.e., only retrieve and render images on the
viewport). Your web application now only focuses on the UI and lets the
workers do the rest.
Keep in mind that this is only the beginning and that we expect to see more usage or Web Workers in the near future.
If you have been using Ionic 2, you already know that it is using TypeScript.
TypeScript is a superset of JavaScript ES2015 that compiles to plain
JavaScript. With TypeScript, you have access to all of its unique
features (like interfaces, mixins, and so on) and ES2015 features (like
arrow functions, generator, multiline strings, and so on).
Let’s look at an example of an Angular >= 2.x component that displays a name of a United States president:
import { Component } from '@angular/core';
export interface IPresident {
id: number;
name: string;
}
@Component({
selector: 'my-app',
template: `
<h1>{{title}}</h1>
<h2>{{president.name}}</h2>
`
})
export class AppComponent {
title:string = 'President of the United States';
president: IPresident = {
id: 44,
name: 'Barack Obama'
};
}
We use an Interface (IPresident) that
describes the president Object shape. It is interesting to have
interfaces describing what you are manipulating, especially if there are
several developers on a project. If you make a mistake and, for
instance, use a boolean for the president name, your IDE will tell you that something is wrong even before the compilation happens.
In
virtually any IDE you use (Visual Studio Code, Atom, WebStorm, or the
like), you will find plugins to enable autocomplete, type checking, and a
linter.
TypeScript is a real advantage for Ionic 2, as it makes
your code more understandable, helps you avoid type mistakes, and helps
you be more productive (through features like autocomplete, auto import
of modules, tooltip definitions on hover, and CTRL + Click to go to definitions). Building mobile apps with ionic 2
All New CLI v2
The Ionic CLI v2 adds a way to generate Pages, Components, Pipes, and Directives, directly via the command line.
For instance, if you want to create a new page named MyPage, here is the command you can run:
The command will follow the conventions and create three files for you:
An HTML file for your template. A SASS file for your component style. A TypeScript file for your component logic.
Here is what the generated my-page.ts file looks like:
import { Component } from '@angular/core';
import { NavController, NavParams } from 'ionic-angular';
@Component({
selector: 'page-my-page',
templateUrl: 'my-page.html'
})
export class MyPagePage {
constructor(public navCtrl: NavController, public navParams: NavParams) {}
ionViewDidLoad() {
console.log('ionViewDidLoad MyPagePage');
}
}
Enforcing conventions via use of the CLI is great when
you work on a team. Angular 2.x and Ionic 2 are doing a great job of
helping foster a better understanding of what an Angular app
architecture should be. Of course, you are free to diverge from the
conventions, if you want to.
Improved Packaging
Ionic
1 relies on the Gulp ecosystem to bundle applications, while Ionic 2
lets you select your favorite tools. Ionic 2 provides its own collection
of tools as a separated project: ionic-app-scripts.
The ionic-app-scripts
is based on the idea that developers should not worry about packaging
configuration at all. The only packaging related dependency that your
project will have with Ionic 2 is @ionic/app-scripts. By default, it uses Webpack but you can use Rollup as well.
With Ionic 2 and the CLI v2, the assets, as well as the TypeScript files, live in the same src folder. The www is now generated during every build and therefore should be removed from version control tracking.
Introduction of Error Reporting Tool
The new CLI also introduced a great Error Reporting tool. To get it, you need to install Ionic version >= 2.1:
$ npm install -g ionic
$ ionic -v
# should return at least 2.1.12
Now every time you have errors, a modal will pop up with meaningful information about it. For example:
Being
notified about runtime errors as soon as possible during development is
incredibly valuable and Ionic 2 has done a great job in this regard.
Benefits of Ahead of Time Compilation (AoT)
Ahead
of Time Compilation (AoT) is a little revolution in the Angular
ecosystem. Introduced with Angular 2.x, AoT allows for templates to be
pre-compiled in a build step, instead of being compiled on-the-fly by
the browser.
While this may not seem like a big difference, it
actually is. With AoT, we do not have to ship the template compiler with
the application. This has two advantages. First, the bundle will be
smaller, which directly impacts the network and therefore makes your
application faster to download. Second, the app will bootstrap faster
because template compilation on-the-fly is no longer necessary.
Ionic 2 takes full advantage of Angular 2.x AoT to optimize the size and loading time of your application for free.
Overall,
Ionic 2 is a huge step forward for the hybrid mobile industry. Although
the set of Ionic 2 components is similar to Ionic 1 components, Ionic 2
offers a lot of tools and performance improvement.
Indeed, with tools such as TypeScript, ionic-app-scripts and Ionic CLI, Ionic 2 developers can be more productive, can produce more maintainable code, and are alerted to runtime errors as soon as they happen.
It also provides a free performance boost relative to Ionic 1, in particular by eliminating or reducing its bottlenecks (related to change detection, animations, loading time, and so on).
With
This, your applications will feel more native than ever. Take it out
for a spin. You’ll be glad you did. For more info click here >>Building mobile apps with ionic 2
One question you may ask yourself, is why Reactive? What about Promises? Promises are good for solving asynchronous operations such as querying a service with an XMLHttpRequest, where the expected behavior is one value and then completion. The Reactive Extensions for JavaScript
unifies both the world of Promises, callbacks as well as evented data
such as DOM Input, Web Workers, Web Sockets. Once we have unified these
concepts, this enables rich composition. Click here for more info about
-->> Reactive Application Development
ReactiveX is a library for composing asynchronous and event-based programs by using observable sequences.
It
extends the observer pattern to support sequences of data and/or events
and adds operators that allow you to compose sequences together
declaratively while abstracting away concerns about things like
low-level threading, synchronization, thread-safety, concurrent data
structures, and non-blocking I/O.
It is sometimes called “functional reactive programming” but this is a misnomer. ReactiveX may be functional, and it may be reactive, but “functional reactive programming” is a different animal. One main point of difference is that functional reactive programming operates on values that change continuously over time, while ReactiveX operates on discrete values that are emitted over time.
Why Use Observables?
The ReactiveX
Observable model allows you to treat streams of asynchronous events
with the same sort of simple, composable operations that you use for
collections of data items like arrays. It frees you from tangled webs of
callbacks, and thereby makes your code more readable and less prone to
bugs.
///Declare an observable
public ISubject<MouseEventArgs> MouseMove;
///Publish data
MouseMove.OnNext(args);
///Subscribe to an observable
MouseMove.Subscribe(args => Display(args));
ReactiveX
provides a collection of operators with which you can filter, select,
transform, combine, and compose Observables. This allows for efficient
execution and composition.
You can think of the Observable class
as a “push” equivalent to Iterable, which is a “pull.” With an Iterable,
the consumer pulls values from the producer and the thread blocks until
those values arrive. By contrast, with an Observable the producer
pushes values to the consumer whenever values are available. This
approach is more flexible, because values can arrive synchronously or
asynchronously.
Write us for more information at info@linkites.com
Speed Because Meteor use
one language on the front end and back it end, it dramatically speeds
development time and is great for rapid prototyping. This coupled with
our agile development process yields more iteration cycles per time
period and more learning “runway” to help you build a successful
product.
Quality Meteor is
a more elegant way to code and simplifies the code base. Both
developers and clients love it because less code = less bugs = higher
product quality and stability.
Cross Platform Flexibility Meteor now makes it possible to leverage one code base for desktop, iOS Applications and Android applications, and the ability to update them all much more easily than ever before. This is huge.
Node.js is Javascript and the same language can be used on
the backend and frontend. It breaks down the boundaries between front-
and back-end development
Since employing NodeJS, Linkites has become highly successful at developing applications that are:
Node.js is Event driven & heavily I/O bound oriented.
Node.js is able to handle a large number of concurrent connections with other systems.
Most applications typically work with data. Until recently, Android developers had to write a lot of code because of no first-class platform support for data binding.
Developers need to get the data for a database or user input and then assign values to the elements that present it to the user in the UI. This made Android data binding a pretty laborious, non-intellectual exercise for developers.
In Google IO 2015, a new data binding library was demonstrated; it removes the need to write such code. This library helps change the data binding development into the following three steps:
Create a binding from a layout
Retrieve the data
Bind the data to the view
This reduction in code authoring is powered by code that is generated by the data binding library that analyzes the layout file. The Gradle plugin then creates a binding class file and then creates binding methods in the class file.
To use data the binding library, you will need to use a newer version of Android Studio and associated build tools. We also need to update the Android Plug-in for Gradle to version 1.3 or later, and add the latest Data Binding plugin. You can get these by installing or updating the Android Support Repository and Android Support library to the latest version.
