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Node.js
1. Node.js
Node.js® is a JavaScript runtime built on Chrome's V8 JavaScript engine. ... As an asynchronous event driven JavaScript runtime, Node is designed to build scalable network applications. From the Node.js web site at
http://https://nodejs.org .
Node.js, or just Node, is a JavaScript-based system for server-side actions involving communication (e.g., web server processing). Node.js can also be used for command line processing, robotics control, etc.
The Node package manager is called
npm, for "
Node Package Manager".
2. CentOS 7 installation
The following Linux command(s) add the Node.js repository so yum can find node to install.
cd ~
curl -sL https://rpm.nodesource.com/setup_10.x | sudo bash -
The following Linux command(s) install Node.
sudo yum -y install nodejs
3. Verify the version
The following Linux command(s) check the installed node version.
node --version
On
2019-08-09 the output was as follows.
v10.16.2
The following Linux command(s) check the installed npm version.
npm --version
On
2019-08-04 the output was as follows.
6.9.0
4. Hello world in JavaScript
The file type of a
JavaScript program file is
js.
The following Linux command(s) create/edit a hello program in the your home directory using the nano text editor.
nano ~/hello.js
Create the following program text in the editor that will output the text "Hello world"
console.log("Hello world");
To exit with save, remember to press
Ctrl-X, then "
y" (for yes) and
Enter to exit.
The following Linux command(s) run the program.
node ~/hello.js
The output should be as follows.
Hello world
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