Edge Computing with Cloudflare Workers & Deno · Pelajaran

Hal-Hal Penting tentang Runtime Deno

Jelajahi fitur inti dan alat bawaan Deno, serta perbedaannya dari Node.js.

Hal-Hal Penting tentang Runtime Deno adalah pelajaran Edge Computing with Cloudflare Workers & Deno gratis di CoddyKit. Ini adalah pelajaran 1 dari 4. Kamu bisa membaca pelajaran lengkapnya di bawah secara gratis — lalu praktikkan langsung di browser dengan editor kode bawaan dan tutor AI 24/7. Ini adalah bagian dari jalur belajar Edge Computing with Cloudflare Workers & Deno, dan progresmu tersinkronisasi di web dan aplikasi CoddyKit. Kursus Edge Computing with Cloudflare Workers & Deno mencakup 4 pelajaran total.

Bagian dari pelajaran ini belum diterjemahkan dan ditampilkan dalam bahasa Inggris.

Welcome to Deno Essentials

Welcome! In this lesson, we'll dive into Deno, a modern, secure runtime for JavaScript and TypeScript.

Created by Ryan Dahl (who also created Node.js), Deno addresses some of the design choices made in Node.js, focusing on security and a great developer experience.

Security First: Deno's Approach

One of Deno's biggest differences is its security model. By default, Deno scripts run in a sandbox, meaning they have no access to:

The file system
The network
Environment variables
Subprocesses

You must explicitly grant these permissions using command-line flags. This prevents malicious code from doing harm without your knowledge.

Built-in Tooling

Deno comes with a powerful set of built-in tools. Forget installing separate packages for formatting, linting, or testing!

Key tools include:

deno fmt: Code formatter
deno lint: Linter for code quality
deno test: Test runner
deno doc: Documentation generator
deno compile: Compiles scripts into self-contained executables

This integrated experience simplifies project setup and maintenance.

Native TypeScript Support

Deno supports TypeScript out of the box. This means you can write TypeScript code without needing a separate compilation step or tsconfig.json file.

It also embraces ES Modules, allowing you to import modules directly from URLs, much like how browsers work. No more node_modules folder!

Your First Deno Program

Let's write a simple Deno program. Save this as hello.ts (or .js) and run it with deno run hello.ts.

console.log("Hello from Deno!");
console.log("Deno is awesome.");

Deno vs. Node.js: Core Differences

While both Deno and Node.js are JavaScript runtimes, they have fundamental differences:

Security: Deno is secure by default (permissions needed), Node.js has full access.
TypeScript: Deno supports TS natively, Node.js requires transpilation.
Tooling: Deno has built-in tools (fmt, lint, test), Node.js relies on npm packages.
Module System: Deno uses URL-based ES Modules, Node.js uses CommonJS (though ES Modules are gaining traction).
Standard Library: Deno has a robust standard library, Node.js has a smaller core.

The Global Deno Object

Deno exposes a global Deno object that provides access to runtime-specific APIs, like file system operations, network access, and environment variables.

Here's how you can access command-line arguments passed to your script:

console.log("Arguments:", Deno.args);

// Try running: deno run my_script.ts arg1 arg2

Running with Permissions

To demonstrate Deno's permission model, let's try to read a file. This script will fail without explicit permission.

To run it successfully, you'll need to add the --allow-read flag: deno run --allow-read file_reader.ts

try {
  const content = Deno.readTextFileSync("data.txt");
  console.log("File content:\n" + content);
} catch (error) {
  console.error("Error reading file: ", error.message);
  console.error("Hint: Try 'deno run --allow-read file_reader.ts'");
}

Deno Essentials Check

Which of the following statements about Deno is TRUE?

Recap: Deno's Foundation

Great job! In this lesson, you've learned about Deno's foundational features:

Its security-first approach with a granular permission model.
The convenience of its built-in tooling.
Native TypeScript and ES Module support.
The global Deno object for runtime interactions.

These essentials make Deno a powerful and modern runtime for web development, especially at the edge!

Pertanyaan yang Sering Diajukan

Apakah pelajaran “Hal-Hal Penting tentang Runtime Deno” gratis?

Ya — teks lengkap “Hal-Hal Penting tentang Runtime Deno” gratis dibaca di sini di web. Untuk praktiknya secara interaktif (editor kode bawaan dan tutor AI 24/7) dan buka sisa kursus Edge Computing with Cloudflare Workers & Deno, upgrade ke CoddyKit PRO. Kursus Edge Computing with Cloudflare Workers & Deno mencakup 4 pelajaran total.

Apa yang akan aku pelajari di “Hal-Hal Penting tentang Runtime Deno”?

Jelajahi fitur inti dan alat bawaan Deno, serta perbedaannya dari Node.js. Kamu berlatih Edge Computing with Cloudflare Workers & Deno dengan kode praktik yang langsung kamu jalankan di browser, dan tutor AI 24/7 menjawab pertanyaanmu saat kamu mengerjakan pelajaran ini.

Apakah aku perlu pengalaman untuk memulai Edge Computing with Cloudflare Workers & Deno?

Tidak diperlukan pengalaman sebelumnya. Edge Computing with Cloudflare Workers & Deno di CoddyKit dirancang untuk pemula hingga pelajar tingkat lanjut, jadi kamu bisa memulai di sini atau dari awal dan belajar sesuai kecepatan kamu sendiri. Ini adalah pelajaran 1 dari 4.

Berapa lama pelajaran “Hal-Hal Penting tentang Runtime Deno” memakan waktu?

Sebagian besar pelajaran CoddyKit memakan waktu sekitar 5–10 menit. Setiap pelajaran ringkas dan interaktif, jadi kamu membuat kemajuan stabil dan melanjutkan dari tempat kamu tinggalkan di web dan aplikasi.

Bisakah aku menulis dan menjalankan kode dalam pelajaran Edge Computing with Cloudflare Workers & Deno ini?

Ya. Setiap pelajaran Edge Computing with Cloudflare Workers & Deno menyertakan editor kode bawaan, jadi kamu menulis dan menjalankan kode nyata langsung di browser dan mendapatkan umpan balik AI instan — tidak diperlukan penyiapan lokal.

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