Introduction To Node
- Why Node.js?
- Explain what Node is.
- Run applications with Node.
- Node Debugging tool.
What is Node.js ?
When Node.js performs an I/O operation, like reading from the network, accessing a database or the filesystem, instead of blocking the thread and wasting CPU cycles waiting, Node.js will resume the operations when the response comes back. This allows Node.js to handle thousands of concurrent connections with a single server without introducing the burden of managing thread concurrency, which could be a significant source of bugs.
In Node.js the new ECMAScript standards can be used without problems, as you don’t have to wait for all your users to update their browsers – you are in charge of deciding which ECMAScript version to use by changing the Node.js version, and you can also enable specific experimental features by running Node.js with flags.
A Vast Number of Libraries
Many program languages have some sort of package manager associated with them. These package managers help developers when they need to install external libraries and tools for building servers, testing code, and much more. Node’s de facto package manager is NPM .
npm with its simple structure helped the ecosystem of Node.js proliferate, and now the npm registry hosts over 1,000,000 open source packages you can freely use.
We expect that all of you have installed node.js,if you did you can skip this section, otherwise you can follow the next steps,
Go to nodejs.org , download the LTS version and follow the default steps.
To check that everything has been correctly set up, open the terminal/console and run the following command:
If everything is completed successfully, you will be seeing the version of Node.JS displayed on your terminal/console window.
Run applications with Node:
The usual way to run a Node.js program is to run the node globally available command (once you install Node.js) and pass the name of the file you want to execute.
Above, you are explicitly telling the shell to run your script with node.
you can close your running program in the console with ctrl-C.
Intro node.js : https://nodejs.dev/en/learn/introduction-to-nodejs/.
In this section you can find a lot of helpful links to other content. This is a supplemental material for you if you want to dive deeper into some concepts.