Factorial Calculator - Elm Typing CST Test
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Factorial Calculator — Elm Code
Calculates factorial of a number using recursion.
module Main exposing (..)
import Browser
import Html exposing (Html, text, div)
fact n = if n == 0 then 1 else n * fact (n-1)
view = div [] [ text (String.fromInt (fact 5)) ]
main = Browser.sandbox { init = (), update = \_ model -> model, view = \_ -> view }Elm Language Guide
Elm is a functional programming language for front-end web development that compiles to JavaScript. It emphasizes simplicity, maintainability, and robustness through strong static typing, immutability, and a no-runtime-errors guarantee, making it ideal for building reliable web applications.
Primary Use Cases
- ▸Front-end web application development
- ▸Single-page applications (SPAs)
- ▸Interactive dashboards and data visualization
- ▸Real-time user interfaces
- ▸Educational projects teaching functional programming for web
Notable Features
- ▸Strong static typing with type inference
- ▸No runtime exceptions for type-safe programs
- ▸Immutable data structures
- ▸Pure functions with side effects managed via Elm Runtime
- ▸The Elm Architecture (TEA) for structured applications
Origin & Creator
Elm was created in 2012 by Evan Czaplicki as part of his thesis project at Harvard University to improve front-end development with functional programming principles.
Industrial Note
Elm is mostly used in web development projects requiring high reliability and maintainable codebases. Its concepts have influenced frameworks like Redux in JavaScript.