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Elm vs ReasonML: What are the differences?

# Introduction
This markdown will outline the key differences between Elm and ReasonML.

1. **Syntax**: Elm has a more rigid syntax with a focus on simplicity and readability, while ReasonML offers more flexibility and is closer to traditional JavaScript syntax.
2. **Type System**: Elm has a simpler type system with strong static typing, while ReasonML provides a more complex type system with support for both static and dynamic typing.
3. **Frameworks and Ecosystem**: Elm has a smaller but more curated ecosystem with its own framework, while ReasonML can leverage the larger ecosystem of JavaScript libraries and frameworks.
4. **Compilation Target**: Elm compiles to JavaScript only, while ReasonML can target both JavaScript and native code with the help of BuckleScript.
5. **Immutability**: Elm enforces immutability by default, making it easier to reason about state changes, whereas ReasonML allows mutability but encourages immutability through its functional programming features.
6. **Community Support**: Elm has a dedicated and friendly community that focuses on simplicity and ease of use, while ReasonML's community is more diverse and includes developers from various backgrounds with different preferences and priorities.

In summary, Elm and ReasonML significantly differ in syntax, type system, ecosystem, compilation targets, approach to immutability, and community support.
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Pros of Elm
Pros of ReasonML
  • 45
    Code stays clean
  • 44
    Great type system
  • 40
    No Runtime Exceptions
  • 33
  • 28
    Easy to understand
  • 23
    Type safety
  • 22
  • 17
    JS fatigue
  • 12
    Ecosystem agrees on one Application Architecture
  • 12
  • 10
    Friendly compiler messages
  • 8
    Fast rendering
  • 7
    If it compiles, it runs
  • 7
    Welcoming community
  • 5
    Stable ecosystem
  • 4
    'Batteries included'
  • 2
  • 4
    Pattern Matching
  • 3
    Type System
  • 1

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Cons of Elm
Cons of ReasonML
  • 3
    No typeclasses -> repitition (i.e. map has 130versions)
  • 2
    JS interop can not be async
  • 2
    JS interoperability a bit more involved
  • 1
    More code is required
  • 1
    No JSX/Template
  • 1
    Main developer enforces "the correct" style hard
  • 1
    No communication with users
  • 1
    Backwards compability breaks between releases
  • 1

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What is Elm?

Writing HTML apps is super easy with elm-lang/html. Not only does it render extremely fast, it also quietly guides you towards well-architected code.

What is ReasonML?

It lets you write simple, fast and quality type safe code while leveraging both the JavaScript & OCaml ecosystems.It is powerful, safe type inference means you rarely have to annotate types, but everything gets checked for you.

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What companies use Elm?
What companies use ReasonML?
See which teams inside your own company are using Elm or ReasonML.
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What tools integrate with Elm?
What tools integrate with ReasonML?
What are some alternatives to Elm and ReasonML?
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If you've ever built a JavaScript application, the chances are you've encountered – or at least heard of – frameworks like React, Angular, Vue and Ractive. Like Svelte, these tools all share a goal of making it easy to build slick interactive user interfaces. Rather than interpreting your application code at run time, your app is converted into ideal JavaScript at build time. That means you don't pay the performance cost of the framework's abstractions, or incur a penalty when your app first loads.
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