Angular Tutorial for Beginners | Introduction to Angular

The Angular is an open-source and helps us build dynamic & single-page applications (SPAs). In this article, we will give you a brief introduction to Angular.

What is Angular?

This topic can help you understand Angular: what Angular is, what advantages it provides, and what you might expect as you start to build your applications.

Angular is a development platform, built on TypeScript. As a platform, Angular includes:

A component-based framework for building scalable web applications
A collection of well-integrated libraries that cover a wide variety of features, including routing, forms management, client-server communication, and more
A suite of developer tools to help you develop, build, test, and update your code

With Angular, you're taking advantage of a platform that can scale from single-developer projects to enterprise-level applications. Angular is designed to make updating as straightforward as possible, so take advantage of the latest developments with a minimum of effort. Best of all, the Angular ecosystem consists of a diverse group of over 1.7 million developers, library authors, and content creators.

Getting Started with Angular

Features of Angular

Angular is loaded with Power-packed Features. Some of the features are listed below

Two-Way Data Binding
This is the coolest feature of the Angular. Data binding is automatic and fast. changes made in the View is automatically updated in the component class and vice versa
Powerful Routing Support
The Angular Powerful routing engine loads the page asynchronously on the same page enabling us to create a Single Page Applications.
Expressive HTML
Angular enables us to use programming constructs like if conditions, for loops, etc to render and control how the HTML pages.
Modular by Design
Angular follows the modular design. You can create Angular modules to better organize and manage our codebase
Built-in Back End Support
Angular has built-in support to communicate with the back-end servers and execute any business logic or retrieve data
Active Community
Angular is Supported by google and has a very good active community of supporters. This makes a lot of difference as your queries are quickly resolved.

Angular has changed massively from the AngularJS. Angular completely redesigned from scratch. There are many concepts of angularJS that have changed in Angular.

Key differences between AngularJs & Angular

Support for ES6

Angular is completely written in Typescript and meets the ECMAScript 6 specification. This means that it has support for ES6 Modules, Class frameworks, etc.

In AngularJS we had Controllers. In Angular Controllers are replaced with Angular Components. The controllers and view in AngularJS is defined as follows

//View 
<body ng-controller=’appController’>     
    <h1>vm.message<h1> 
</body> 
 
//Controller angular.module(‘app’).controller(‘appController’,appcontroller) {     
    message=’Hello Angular’; 
}

In Angular, we are using Components. The simple component is shown below written using Typescript.

import { Component } from '@angular/core'; 
 
@Component({     
    selector: 'app',     
    template: '<h1>{{message}} </h1>' 
}) 
export class AppComponent  {
      message: string=’Hello Angular’; 
}

In Angular, a component represents a UI element. You can have many such components on a single web page. Each component is independent of each other and manages a section of the page. The components can have child components and parent components.

Directives

The AngularJS had a lot of directives. Some of the most used directives are ng-repeat & ng-if

<ul>     
    <li ng-repeat =customer in vm.customers> 
        {{customer.name}}     
    </li> 
</ul> 
<div ng-if=”vm.isVIP”>     <h3> VIP Customer </h3> </div>

The Angular also has directives, but with a different syntax. It has a * before the directive name indicating it as a structural directive

<ul>     
    <li *ngFor =#customer of customers>         
        {{customer.name}}     
    </li> 
</ul> 
<div *ngIf=”vm.isVIP”> 
    <h3> VIP Customer </h3> 
</div>

The style directives like ng-style, ng-src & ng-href are all gone. These are now replaced by property binding HTML elements to the class properties

The creation of Custom Directives is vastly simplified in angular as shown in the example below.

@Directive({     
   selector: '[MyDirective]' 
}) 
class MyDirective { }

Data Bindings

The powerful angular data bindings stay the same, with minor syntax changes.

Interpolation

//AngularJS   
<h3> {{vm.customer.Name}}</h3>  
 
//Angular 
<h3> {{customer.Name}}</h3>

Note that we used controller alias VM to specify the controller instance in AngularJS. In Angular, the context is implied.

One way Binding

//AngularJS 
<h3> ng-bind=vm.customer.name></h3> 
 
//Angular 
<h3 [innerText]=”customer.name” ></h3>

The Angular can bind to any property of the HTML element.

Event Binding

//AngularJS 
<button ng-click=”vm.save()”>Save<button>  
 
//Angular 
<button (click)=”save()”>Save<button>

The AngularJS uses the ngClick directive to bind to the event. In Angular ngClick Directive is removed. You can bind directly to the DOM events

Two- way binding

//AngularJS 
<input ng-model=”vm.customer.name”>  
 
//Angular 
<input [(ng-model)]=”customer.name”>

$scopes are out

Angular is not using $scope anymore to glue view and controller.

AngularJS used to run a dirty checking on the scope objects to see if any changes occurred. Then it triggers the watchers. And then it used to re-running the dirty checking again.

The Angular is using zone.js to detect changes. Zone.js apply patches on all the global asynchronous operations like click event, timer events, HTTP requests, etc. It then intimates the Angular, whenever the changes occur in Angular Application. The Angular then runs the change detection for the entire application

Filters are renamed to Pipes

In AngularJS, we used Filters and as shown below

<td>{{vn.customer.name | uppercase}}</td>

Angular uses the same syntax but names them as pipes

<td>{{customer.name | uppercase}}</td>

Platform-specific Bootstrap

In AngularJS we used the ng-app directive in our HTML, then the Angular would bootstrap and attach itself the ng-app

<body ng-app=’app’> </html>

The bootstrapping in Angular is done through code. The bootstrapping of Angular is not simple as that of AngularJS. The sample code below shows how Angular application bootstraps the AppModule using platformBrowserDynamic Module

import { platformBrowserDynamic } from '@angular/platform-browser-dynamic'; 
import {AppModule } from './app.module'; platformBrowserDynamic().bootstrapModule(AppModule);

The Bootstrap is also Platform-specific in Angular. You can have different bootstrapper for mobile & Web application.

Services

The AngularJS had Services, Factories, Providers, Constants and values, which used to create reusable code. These are then injected into Controllers so that it can use it

The Angular is changed drastically from AngularJS in many aspects and it has become a lot easier and faster.

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Angular Tutorial for Beginners | Introduction to Angular

akshay L

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Angular Tutorial | Angular Tutorial For Beginners | Angular Training | Intellipaat

In this Angular tutorial you will learn what is angular, angular architecture, what is typescript, Data binding & interpolation, angular components, Variable Declaration & Function Declaration, Encapsulation & Polymorphism in Angular, Angular Routing and Navigation, various angular basic & advanced concepts, hands-on demo on how to import & export data in angular, Angular JS vs Angular vs React JS and angular CLI among others.

#angular tutorial #angular tutorial for beginners #angular training

Christa Stehr

1598940617

Install Angular - Angular Environment Setup Process

Angular is a TypeScript based framework that works in synchronization with HTML, CSS, and JavaScript. To work with angular, domain knowledge of these 3 is required.

Installing Node.js and npm
Installing Angular CLI
Creating workspace
Deploying your First App

In this article, you will get to know about the Angular Environment setup process. After reading this article, you will be able to install, setup, create, and launch your own application in Angular. So let’s start!!!

Install Angular in Easy Steps

For Installing Angular on your Machine, there are 2 prerequisites:

Node.js
npm Package Manager

Node.js

First you need to have Node.js installed as Angular require current, active LTS or maintenance LTS version of Node.js

Download and Install Node.js version suitable for your machine’s operating system.

Npm Package Manager

Angular, Angular CLI and Angular applications are dependent on npm packages. By installing Node.js, you have automatically installed the npm Package manager which will be the base for installing angular in your system. To check the presence of npm client and Angular version check of npm client, run this command:

npm -v

Installing Angular CLI

Open Terminal/Command Prompt
To install Angular CLI, run the below command:

npm install -g @angular/cli

· After executing the command, Angular CLI will get installed within some time. You can check it using the following command

ng --version

Workspace Creation

Now as your Angular CLI is installed, you need to create a workspace to work upon your application. Methods for it are:

Using CLI
Using Visual Studio Code

1. Using CLI

To create a workspace:

Navigate to the desired directory where you want to create your workspace using cd command in the Terminal/Command prompt
Then in the directory write this command on your terminal and provide the name of the app which you want to create. In my case I have mentioned DataFlair:

Ng new YourAppName

After running this command, it will prompt you to select from various options about the CSS and other functionalities.

To leave everything to default, simply press the Enter or the Return key.

#angular tutorials #angular cli install #angular environment setup #angular version check #download angular #install angular #install angular cli

Jeromy Lowe

1599097440

Data Visualization in R with ggplot2: A Beginner Tutorial

A famous general is thought to have said, “A good sketch is better than a long speech.” That advice may have come from the battlefield, but it’s applicable in lots of other areas — including data science. “Sketching” out our data by visualizing it using ggplot2 in R is more impactful than simply describing the trends we find.

This is why we visualize data. We visualize data because it’s easier to learn from something that we can see rather than read. And thankfully for data analysts and data scientists who use R, there’s a tidyverse package called ggplot2 that makes data visualization a snap!

In this blog post, we’ll learn how to take some data and produce a visualization using R. To work through it, it’s best if you already have an understanding of R programming syntax, but you don’t need to be an expert or have any prior experience working with ggplot2

#data science tutorials #beginner #ggplot2 #r #r tutorial #r tutorials #rstats #tutorial #tutorials

Roberta Ward

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Basics of Angular: Part-1

What is Angular? What it does? How we implement it in a project? So, here are some basics of angular to let you learn more about angular.

Angular is a Typescript-based open-source front-end web application platform. The Angular Team at Google and a community of individuals and corporations lead it. Angular lets you extend HTML’s syntax to express your apps’ components clearly. The angular resolves challenges while developing a single page and cross-platform applications. So, here the meaning of the single-page applications in angular is that the index.html file serves the app. And, the index.html file links other files to it.

We build angular applications with basic concepts which are NgModules. It provides a compilation context for components. At the beginning of an angular project, the command-line interface provides a built-in component which is the root component. But, NgModule can add a number of additional components. These can be created through a template or loaded from a router. This is what a compilation context about.

What is a Component in Angular?

Components are key features in Angular. It controls a patch of the screen called a view. A couple of components that we create on our own helps to build a whole application. In the end, the root component or the app component holds our entire application. The component has its business logic that it does to support the view inside the class. The class interacts with the view through an API of properties and methods. All the components added by us in the application are not linked to the index.html. But, they link to the app.component.html through the selectors. A component can be a component and not only a typescript class by adding a decorator @Component. Then, for further access, a class can import it. The decorator contains some metadata like selector, template, and style. Here’s an example of how a component decorator looks like:

@Component({
    selector: 'app-root',
    templateUrl: 'app.component.html',
    styleUrls: ['app.component.scss']
})

Role of App Module

Modules are the package of functionalities of our app. It gives Angular the information about which features does my app has and what feature it uses. It is an empty Typescript class, but we transform it by adding a decorator @NgModule. So, we have four properties that we set up on the object pass to @NgModule. The four properties are declarations, imports, providers, and bootstrap. All the built-in new components add up to the declarations array in @NgModule.

@NgModule({
declarations: [
  AppComponent,
],
imports: [
  BrowserModule,
  HttpClientModule,
  AppRoutingModule,
  FormsModule
],
bootstrap: [AppComponent]
})

What is Data Binding?

Data Binding is the communication between the Typescript code of the component and the template. So, we have different kinds of data binding given below:

When there is a requirement to output data from our Typescript code in the HTML template. String interpolation handles this purpose like {{data}} in HTML file. Property Binding is also used for this purpose like [property] = “data”.
When we want to trigger any event like clicking a button. Event Binding works while we react to user events like (event) = “expression”.
When we can react to user events and output something at the same time. Two-way Binding is used like [(ngModel)] = “data”.

image for understanding data binding

#angular #javascript #tech blogs #user interface (ui) #angular #angular fundamentals #angular tutorial #basics of angular

Willie Beier

1596728880

Tutorial: Getting Started with R and RStudio

In this tutorial we’ll learn how to begin programming with R using RStudio. We’ll install R, and RStudio RStudio, an extremely popular development environment for R. We’ll learn the key RStudio features in order to start programming in R on our own.

If you already know how to use RStudio and want to learn some tips, tricks, and shortcuts, check out this Dataquest blog post.

1. Install R
2. Install RStudio
3. First Look at RStudio
4. The Console
5. The Global Environment
6. Install the [tidyverse](https://www.dataquest.io/blog/tutorial-getting-started-with-r-and-rstudio/#tve-jump-173bb26184b) Packages
7. Load the [tidyverse](https://www.dataquest.io/blog/tutorial-getting-started-with-r-and-rstudio/#tve-jump-173bb264c2b) Packages into Memory
8. Identify Loaded Packages
9. Get Help on a Package
10. Get Help on a Function
11. RStudio Projects
12. Save Your “Real” Work. Delete the Rest.
13. R Scripts
14. Run Code
15. Access Built-in Datasets
16. Style
17. Reproducible Reports with R Markdown
18. Use RStudio Cloud
19. Get Your Hands Dirty!
Additional Resources
Bonus: Cheatsheets

#data science tutorials #beginner #r tutorial #r tutorials #rstats #tutorial #tutorials