Learn ELM with Real Code Examples

The Elm Architecture (TEA) with Model, Update, and View functions

Immutable data flow

One-way data binding

Subscriptions for side effects

Module-based project structure

Elm code compiled to JavaScript

Model state flows through Update function

View function renders virtual DOM

Commands and Subscriptions handle side effects

Browser updates DOM efficiently

The Elm Architecture (Model, Update, View)

Pure functions drive program behavior

One-way data flow

Encapsulation via modules

Subscriptions for event-driven programming

Single-page applications (SPA)

Interactive dashboards and charts

Real-time communication apps

Form-heavy applications

Games using Elm graphics library

Pure functional programming

Immutable data by default

Type safety and no runtime exceptions

Simplicity and maintainability

Predictable and structured architecture (TEA)

Organize large apps into modules

Use Msg and Update hierarchies for large state trees

Batch Cmds for efficiency

Optimize subscriptions

Compile with optimizations for production

Port Elm 0.18 projects to Elm 0.19

Update TEA patterns to current syntax

Replace deprecated modules with core Elm packages

Refactor ports for JS interop

Ensure type-safe conversions