Question 1

What is Deno?

Accepted Answer

Deno is a secure runtime for executing JavaScript and TypeScript code, built on the V8 engine and Rust programming language. It is created by the same developer who created Node.js, Ryan Dahl, with the aim to address some limitations and shortcomings of Node.js. It provides better security, improved dependency management and built-in TypeScript support.

Question 2

How is Deno different from Node.js?

Accepted Answer

Some major differences between Deno and Node.js are:
- Deno is secure by default, requiring permissions to access the file system, network, or environment variables.
- Deno supports TypeScript out-of-the-box without any need for additional configuration or tools.
- Deno does not have a package manager like npm; instead, it imports and caches libraries directly from a URL.
- Deno's module system is based on standard ES modules, unlike Node.js's CommonJS module system.

Question 3

How do I run a Deno script?

Accepted Answer

To run a Deno script, you use the `deno run` command followed by the script file or URL. For example, to run a local script `hello.ts`, you would run `deno run hello.ts`. To run a script directly from a URL, use `deno run https://example.com/some-script.ts`.

Question 4

Can I use Node.js libraries with Deno?

Accepted Answer

Deno does not support direct usage of Node.js libraries, mainly due to differences in module systems and APIs between the two platforms. However, there are compatibility libraries like "deno_std_node" that provide some level of compatibility with Node.js modules. Always check the library's documentation and adapt your code to work with Deno specific modules and libraries when possible.

Question 5

How do I specify permissions while running a Deno script?

Accepted Answer

To specify permissions while running a Deno script, use flag options with the `deno run` command. Examples of available permissions are: 
- `--allow-read`: Allows read access to the file system.
- `--allow-write`: Allows write access to the file system.
- `--allow-net`: Allows network access.
- `--allow-env`: Allows access to environment variables.

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