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Elm

Elm

Elm is a friendly functional language for the Web

Master Elm with
Interactive Learning

Elevate your Elm skills through 112 curated exercises across 28 core concepts. Master problem-solving with a structured learning path designed for modern developers.

Elm

About Elm

Elm describes itself as a "delightful language for reliable webapps". It aims at producing web applications with great performances and no runtime exception.

Concretely, it is a functional programming language compiling to JavaScript. Its syntax and features originated from the ML family of languages, such as Haskell, but with a strong emphasis on learnability and simplicity.

You can learn more about elm on the official website, elm-lang.org. Newcomers should start with the elm guide, located at guide.elm-lang.org.

Key Features of Elm

For the Web

Elm is for making Web applications.

Delightful

Elm aims at the most enjoyable developer experience possible.

Excellent performance

Elm has tiny compilation times, small assets and a fast runtime.

No runtime exception

Thanks to strict typing, Elm catches potential errors at compilation.

JavaScript interop

Elm has a dedicated interop mechanism with JavaScript called ports.

Functional but simple

Elm is a simple pure functional language, a good gateway for more advanced functional languages.

Track icon

For the Web

Elm is for making Web applications.

Delightful

Elm aims at the most enjoyable developer experience possible.

Excellent performance

Elm has tiny compilation times, small assets and a fast runtime.

No runtime exception

Thanks to strict typing, Elm catches potential errors at compilation.

JavaScript interop

Elm has a dedicated interop mechanism with JavaScript called ports.

Functional but simple

Elm is a simple pure functional language, a good gateway for more advanced functional languages.

A taste of Elm concepts you'll cover

Ba

Basics 1

Ba

Basics 2

Bi

Bitwise Operations

Bo

Booleans

Li

Lists

Re

Records

Cu

Custom Types

Le

Let

Ma

Maybe

St

Strings

Ar

Arrays

Pa

Partial Application and Function Composition

Di

Dict

Tu

Tuples

Re

Result

Pa

Parsing

Co

Comparison

Ra

Random

Pa

Pattern Matching

Se

Set

Js

JSON

We

Web Applications

Ti

Time

Re

Recursion

Ge

Generics

Op

Opaque Types

Ta

Tail Call Recursion

Ph

Phantom Types

Dive into Elm practice challenges

Hello World
Hello World
Level 1

SlaveCode's classic introductory exercise. Just say "Hello, World!".

Two Fer
Two Fer
Level 1

Create a sentence of the form "One for X, one for me.".

Bob
Bob
Level 3

Bob is a lackadaisical teenager. In conversation, his responses are very limited.

Darts
Darts
Level 2

Calculate the points scored in a single toss of a Darts game.

Leap
Leap
Level 3

Determine whether a given year is a leap year.

Resistor Color
Resistor Color
Level 2

Convert a resistor band's color to its numeric representation.