Getting Started with Deno.js
Introduction to Deno.js
It’s
not been so long since. The creator of Node.js has been working on a new JavaScript runtime
called Deno that heals some of the problems identified in Node.Js.
Deno is a runtime for JavaScript and TypeScript this is based on chrome V8 Javascript engine and the rust programming language. It was created by Ryan Dhal, Orignal creator of Node.js and is focused on productivity.
Deno explicitly takes on the role of both runtime and a package manager with a single executable, rather than a separate package-management program.
Features
- An improved Security Model
- Decentralized Package Management
- Standard Library
- Built in Tooling
Installation:
Deno works on macOS, Linux and Windows. Deno is a single binary Executable. It has no external dependency.
Download and Install:
deno_install provides convenience scripts to download and install the binary.
Using Shell (macOS, Linux):
Using PowerShell (Windows):
Using Homebrew (macOS):
brew install deno
Using Chocolatey (Windows):
Using Scoop (Windows):
Deno binaries can also be installed manually, by downloading a zip file on CLICKING_HERE. These packages contain just a single executable file.
You will have to set the executable bit on macOS and Linux.
Testing Your Installation
To test your installation, run deno --version. It will print the deno version on console, if the installation was successful.
Use deno help to see help text documenting Deno's flags and usage.
Use deno help <subcommand> for subcommand specific flags.
Updating
To update a previously installed version of Deno, You can run deno upgrade. This will fetch the latest release from here, unzip it, and replace your current executable with it.
Getting Started
Try running the simple program:
or a more comple one:
import { serve } from "https://deno.land/std@0.50.0/http/server.ts";
const s = serve({ port: 8000 });
console.log("http://localhost:8000/");
for await (const req of s) {
req.respond({ body: "Hello World\n" });
}
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