Angular 5 Tutorial 02 – Creating Hello World Application

In this post, we are going to discuss how to setup development environment and create an initial angular app using CLI.

Whenever I’m creating a new application, I always prefer some standard folder structure or use file generator like Yeoman.

A quick start tool always helps the developer to save their valuable time and use those time efficient way on improving the quality of the application.

Angular provides us Angular CLI which is a command line interface tool that can create a project, add files, and perform a variety of ongoing development tasks such as testing, bundling, and deployment.

Using this CLI, we can create apps with a working condition which uses best practices suggested by Angular Team.

To create an Angular application using Angular CLI, all we need is to follow the below steps:

1. Install Node js and npm on your machine.

Visit Node.js web page and download installer. Once you’ve installed nodejs, the npm will get installed along with it.

2. Verify the compatible version

Angular CLI requires the minimal version of node 6.9.x and npm 3.x.x.

We can check the version of node and npm using following commands.

node -v

npm -v

01

3. Install Angular CLI

Run the following command to install Angular CLI globally.

npm install -g @angular/cli

-g flag is used to install the package globally in the npm.

Once we installed CLI globally, we can confirm whether the tool installed successfully by using the following command.

ng -v

 

4. Create a project

Now, creating a project becomes very simple. We have to run following command,

ng new cool-app

  • cool-app is the name of the project.

 

new-app

Once the files has been created, the CLI will start installing npm packages automatically. Wait until the packages getting installed, it will take a bit of time to complete the process.

The folder and file structure will looks as follows

code_ng-app4.png

5. Serve the application

Once the dependencies are installed, traverse to the created projected and serve the application using the following commands.

cd cool-app

ng serve –open

The ng serve command launches the server, watches your files, and rebuilds the app as you make changes to those files.

Using the –open (or just -o) option will automatically open your browser on http://localhost:4200/.

The default page will gets open with the greeting message.

 

CoolApp.png

 

Stay connected and Keep supporting. 🙂

Happy Coding!

 

In the next post, we can discuss about the architecture of angular application.

npm – a quick walk

Aa a part of learning angular, I would suggest everyone to learn and understand basic concept of npm

May be by finding answers for few of questions listed below

  • What is npm?
  • What is the role of npm?
  • How to use it?
  • Why we are going to use it?

So, what is npm?

npm – node package manager

Let’s split the sentence and understand the meaning present in the abbreviation.

Node

Here node.js is mentioned as node. Node.js is a server-side JavaScript environment. It uses an asynchronous event-driven model and is designed for writing scalable internet applications, notably web servers.

Package

Modules of code grouped up into a component which can be used in various project or application.

Manager

Managing the dependencies with various operation like install, uninstall, update and so on.

Now, we can frame our own definition for npm from above split up explanation. So using npm, we can manage (install, uninstall, organize) the node.js packages in our project.

npm is a package manager for the JavaScript programming language. It is the default package manager for the JavaScript runtime environment Node.js.

npm has CLI terminal and website to search for packages.

What is the role of npm?

npm does N number of roles in various projects. I’m just mentioning the various which we are going to use in our upcoming posts in the end user developer point of view

  • install packages
  • uninstall packages
  • version maintenance of packages across team
  • maintaining the dependencies

How to use it?

Simple, install Node.js

npm is distributed with Node.js- which means that when we download and install Node.js, we automatically get npm installed on our computer.

Using following command in terminal, we can check whether our tool set get installed successfully,

// to check node.js version
node -v

// to check npm version
npm -v

 

packages.json

What is this packages.json? this is the one important thing we should get familiar of we are going for npm.

  • packages.json file is like registry of packages in our project.
  • it lists the packages that our project depends on.
  • allows us to specify the versions of a package that our project can use using semantic versioning rules.

How to create packages.json file?

Open terminal with your target folder location.

Type npm init and Enter, now you’ll be caught up with few questions. After you have answered most of the question, your file will get created.

name and version fields are mandatory fields.

npm_cmd

If you are afraid of questions, we have another quick options.

Enter command npm init –yes

npm_cmd_2

Using –yes argument option, the npm will create packages.json file with default values.

Install a package

npm install (in package directory, no arguments) – Install the dependencies in the local node_modules folder.

In global mode (ie, with -g or --global appended to the command), it installs the current package context (ie, the current working directory) as a global package.

You can find detailed details of npm install options in this link

A package can be downloaded with the command:

npm install <package_name>

The --save and --save-dev install flags

The easier (and more awesome) way to add dependencies to your package.json is to do so from the command line, flagging the npm install command with either --save or --save-dev, depending on how you’d like to use that dependency.

To add an entry to your package.json‘s dependencies:

npm install <package_name> --save

To add an entry to your package.json‘s devDependencies:

npm install <package_name> --save-dev

 

That’s it. Few lines has been copied from official documentation. :p

Lets conclude, using npm we can mange number of packages in our projects easily.

Happy Coding!