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Deno vs Rust: What are the differences?

Deno and Rust are two popular programming languages known for their focus on performance, security, and modern development practices. While both languages have their own unique features and use cases, there are several key differences that set them apart.

  1. Syntax and Programming Paradigm: Deno is a JavaScript/TypeScript runtime that borrows its syntax and programming paradigm from JavaScript, making it easy for JavaScript developers to transition to Deno. On the other hand, Rust is a systems programming language that follows a different syntax and programming paradigm, focusing on low-level memory management and performance optimization.

  2. Memory Management: Deno utilizes the JavaScript garbage collector to manage memory allocation and deallocation, which provides automatic memory management but can result in reduced performance. In contrast, Rust employs a unique ownership system and static memory management, allowing for fine-grained control over memory allocation and deallocation. This results in efficient memory utilization and high-performance applications.

  3. Concurrency: Deno leverages JavaScript's event-driven, single-threaded model to handle concurrent operations. It utilizes asynchronous programming and promises to handle I/O operations efficiently. On the other hand, Rust embraces a different approach to concurrency, using threads and lightweight, asynchronous tasks called "async/await". This enables Rust to achieve high-performance, concurrent execution while maintaining safety and preventing data races.

  4. Runtime Environment: Deno comes bundled with a runtime environment that includes the necessary functionalities for running JavaScript/TypeScript code, such as modules, a standard library, and a dependency manager. In contrast, Rust does not provide a pre-built runtime environment but offers a powerful and flexible ecosystem of libraries and tools for building different types of applications.

  5. Error Handling: Deno's error handling is influenced by JavaScript, primarily relying on exceptions and try-catch blocks to handle errors. While this is familiar to JavaScript developers, it can lead to less predictable behavior and harder-to-debug code. Rust, on the other hand, employs a strong and expressive error handling system based on the concept of Result types. This allows for more explicit and robust error handling, reducing the likelihood of runtime crashes.

  6. Community and Maturity: Deno is a relatively new project that gained popularity in recent years, and its community is still growing. Rust, however, has been around for a longer time and has a more mature and established community. This means that Rust has a wide range of libraries, frameworks, and resources available, making it easier for developers to find support and collaborate on projects.

In summary, Deno and Rust have distinct differences in terms of their syntax, memory management, concurrency models, runtime environment, error handling, and community maturity. While Deno is focused on JavaScript development and offering a modern runtime for JavaScript/TypeScript, Rust is a powerful systems programming language with emphasis on performance, memory safety, and low-level control.

Advice on Deno and Rust
Needs advice
on
JavaScriptJavaScriptPythonPython
and
RustRust

So, I've been working with all 3 languages JavaScript, Python and Rust, I know that all of these languages are important in their own domain but, I haven't took any of it to the point where i could say I'm a pro at any of these languages. I learned JS and Python out of my own excitement, I learned rust for some IoT based projects. just confused which one i should invest my time in first... that does have Job and freelance potential in market as well...

I am an undergraduate in computer science. (3rd Year)

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Replies (3)
Recommends
on
JavaScriptJavaScript

I would start focusing on Javascript because even working with Rust and Python, you're always going to encounter some Javascript for front-ends at least. It has: - more freelancing opportunities (starting to work short after a virus/crisis, that's gonna help) - can also do back-end if needed (I would personally avoid specializing in this since there's better languages for the back-end part) - hard to avoid. it's everywhere and not going away (well not yet)

Then, later, for back-end programming languages, Rust seems like your best bet. Its pros: - it's satisfying to work with (after the learning curve) - it's got potential to grow big in the next year (also with better paying jobs) - it's super versatile (you can do high-perf system stuff, graphics, ffi, as well as your classic api server) It comes with a few cons though: - it's harder to learn (expect to put in years) - the freelancing options are virtually non-existent (and I would expect them to stay limited, as rust is better for long-term software than prototypes)

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Recommends
on
JavaScriptJavaScript

I suggest you to go with JavaScript. From my perspective JavaScript is the language you should invest your time in. The community of javascript and lots of framework helps developer to build what they want to build in no time whether it a desktop, web, mobile based application or even you can use javascript as a backend as well. There are lot of frameworks you can start learning i suggest you to go with (react,vue) library both are easy to learn than angular which is a complete framework.

And if you want to go with python as a secondary tool then i suggest you to learn a python framework (Flask,Django).

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Moinul Moin
Recommends
on
JavaScriptJavaScript

go for javascript, brother.

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Decisions about Deno and Rust
Roman Glushko
Machine Learning, Software Engineering and Life · | 3 upvotes · 346.7K views

I chose Golang as a language to write Tango because it's super easy to get started with. I also considered Rust, but learning curve of it is much higher than in Golang. I felt like I would need to spend an endless amount of time to even get the hello world app working in Rust. While easy to learn, Golang still shows good performance, multithreading out of the box and fun to implement.

I also could choose PHP and create a phar-based tool, but I was not sure that it would be a good choice as I want to scale to be able to process Gbs of access log data

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Pros of Deno
Pros of Rust
  • 18
    Typescript
  • 14
    Secure
  • 13
    Open source
  • 9
    Formatting
  • 9
    Javascript
  • 9
    Great std library
  • 7
    Testing
  • 6
    ESM
  • 5
    Easy Config
  • 3
    No package-lock.json
  • 143
    Guaranteed memory safety
  • 130
    Fast
  • 87
    Open source
  • 75
    Minimal runtime
  • 70
    Pattern matching
  • 63
    Type inference
  • 56
    Concurrent
  • 56
    Algebraic data types
  • 46
    Efficient C bindings
  • 43
    Practical
  • 37
    Best advances in languages in 20 years
  • 32
    Safe, fast, easy + friendly community
  • 30
    Fix for C/C++
  • 25
    Stablity
  • 24
    Zero-cost abstractions
  • 23
    Closures
  • 20
    Extensive compiler checks
  • 20
    Great community
  • 18
    Async/await
  • 18
    No NULL type
  • 15
    Completely cross platform: Windows, Linux, Android
  • 15
    No Garbage Collection
  • 14
    Great documentations
  • 14
    High-performance
  • 12
    Generics
  • 12
    Super fast
  • 12
    High performance
  • 11
    Macros
  • 11
    Fearless concurrency
  • 11
    Guaranteed thread data race safety
  • 11
    Safety no runtime crashes
  • 10
    Helpful compiler
  • 10
    Compiler can generate Webassembly
  • 9
    Prevents data races
  • 9
    Easy Deployment
  • 9
    RLS provides great IDE support
  • 8
    Painless dependency management
  • 8
    Real multithreading
  • 7
    Good package management
  • 5
    Support on Other Languages

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Cons of Deno
Cons of Rust
  • 3
    Still in early development
  • 1
    Bad Rust plugin support
  • 26
    Hard to learn
  • 23
    Ownership learning curve
  • 11
    Unfriendly, verbose syntax
  • 4
    Variable shadowing
  • 4
    High size of builded executable
  • 4
    Many type operations make it difficult to follow
  • 3
    No jobs
  • 1
    Use it only for timeoass not in production

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- No public GitHub repository available -

What is Deno?

It is a secure runtime for JavaScript and TypeScript built with V8, Rust, and Tokio.

What is Rust?

Rust is a systems programming language that combines strong compile-time correctness guarantees with fast performance. It improves upon the ideas of other systems languages like C++ by providing guaranteed memory safety (no crashes, no data races) and complete control over the lifecycle of memory.

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