ELM is a pure programming language used by developers to build complex web applications while the compiler gives plenty of guarantees about their stability. There are certain important features expected from ELM which cannot be found in any other popular domain-specific programming languages and they are:
Server-Side Rendering: The process of sending HTML with the initial response
Code Splitting: Dividing code into smaller chunks for better caching
Lazy Loading: Sending the small chunks of code needed for a particular page
Tree Shaking: Eliminating unnecessary or unused code (called dead-code)
Elm is a simple, domain-specific, strongly-typed, completely functional language used to develop the client side of web applications resulting in increased performance. The compiler goes farther than tools like React.js by offering more informative compiler errors—Elm's vigilant compiler results in straightforward and dependable applications to maintain.
Strong Static Types: Easily finding errors with readable compiler messages
Reactive By Design: Functional Reactive Programming (FRP) is baked right in Elm.js and isn’t opt-in
Immutability and Purity: It is easily maintainable and readable
No Runtime Exceptions: Elm.js enforces the use of a single immutable value to represent the state of the user interface. You will not see runtime errors in practice
No Undefined or Null: It is impossible to leave possible problems unhandled
Elm has a steep learning curve and comes with tons of guides, tips, books, FAQs, and friendly developers’ community. Elm.js is easy to get into an existing project even if you have no prior experience with purely functional languages.
Elm Virtual DOM is more lightweight when compared to React.js’ Virtual DOM. The bundle size of Elm.js is significantly smaller which will make the rendering of the first elements faster on any page, on any device, and in any web browser.
There is built-in functionality that states that if the code is not compiled, it will not run. Elm is always on guard of checking and protecting your production workflow if something has been changed in a package that the project depends on. You will receive a warning message about the incompatibilities if the version number is updated.
Elm is not mutagenic as it is composed of constants, enabling it to produce HTML quickly. It outperforms Angular, Ember, and React in terms of performance because of the presence of the Virtual DOM. The Virtual DOM enables rapid updating of the elements that require modification without requiring the entire page to be re-rendered, which speeds up Elm.js.