Haskell VS ReScript

• Pure Functional Programming
  Haskell emphasizes pure functional programming, meaning functions have no side effects. This leads to code that is easier to understand, test, and maintain.
• Strong Type System
  Haskell's type system is strong and expressive, allowing developers to catch many errors at compile time. This results in more reliable code.
• Lazy Evaluation
  Haskell uses lazy evaluation by default, which can lead to performance improvements by avoiding unnecessary computations and enabling the creation of infinite data structures.
• Immutability
  In Haskell, data is immutable by default. This leads to simpler reasoning about code behavior and reduces bugs related to mutable state.
• High-Level Abstractions
  Haskell provides powerful abstractions like monads, functors, and applicative functors, which can lead to more concise and expressive code.
• Concurrency
  Haskell has excellent support for concurrency and parallelism through its lightweight threading model and software transactional memory, making it suitable for concurrent applications.
• Community and Libraries
  Haskell has a dedicated community and a rich set of libraries and tools, which can help accelerate development and provide solutions to common problems.

Possible disadvantages

• Steep Learning Curve
  Haskell has a steep learning curve, particularly for developers who are new to functional programming or coming from imperative and object-oriented backgrounds.
• Performance Concerns
  While Haskell can be efficient, its performance can sometimes lag behind other languages like C++ or Rust for certain use cases, especially those requiring low-level optimization.
• Limited Industry Adoption
  Haskell is not as widely adopted in industry compared to languages like Java, Python, or JavaScript, which can limit job opportunities and community size.
• Compilation Times
  Haskell's compilation times can be long, especially for large projects, which can slow down the development process.
• Tooling and IDE Support
  While improving, the tooling and IDE support for Haskell is not as mature as for some other popular languages, potentially affecting developer productivity.
• Complexity of Advanced Features
  Some of Haskell's advanced features, such as monads and type-level programming, can be complex and difficult to master, which can be a barrier for new developers.
• Library Gaps
  Although Haskell has many libraries, there might be gaps or less mature libraries for some specific use cases compared to more mainstream languages.

• JavaScript Interoperability
  ReScript offers seamless interoperability with JavaScript, allowing developers to gradually integrate it into existing JavaScript projects without a complete rewrite.
• Familiar Syntax
  ReScript's syntax is user-friendly and similar to JavaScript, making it more accessible to developers familiar with the JavaScript ecosystem.
• Type Safety
  ReScript provides strong static typing that helps catch errors at compile time, reducing the likelihood of runtime errors and improving code reliability.
• Performance
  Code compiled from ReScript is highly optimized, resulting in performance improvements over traditional JavaScript in certain scenarios.
• Active Community
  ReScript has a growing community and active development, offering support, tools, and libraries that continue to evolve.
• Simplified Abstractions
  ReScript offers simplified abstractions compared to some other languages that compile to JavaScript, enabling faster onboarding and easier codebases.

Possible disadvantages

• Learning Curve
  Despite its JavaScript-like syntax, ReScript can still have a steep learning curve for developers unfamiliar with functional programming or type systems.
• Less Mature Ecosystem
  Compared to JavaScript or TypeScript, ReScript's ecosystem is less mature, potentially leading to fewer libraries, tools, or third-party integrations.
• Limited Adoption
  ReScript is not as widely adopted as other languages or frameworks, which might lead to challenges in finding resources, developers, or community support.
• Tooling Limitations
  While evolving, ReScript's tooling support may not be as comprehensive as more established languages, which can impact developer experience.
• Backward Compatibility
  ReScript evolves rapidly, which might lead to breaking changes or deprecated features impacting long-term maintenance of projects.

Functional Programming & Haskell - Computerphile

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Tracking ReScript since Mar 2021.