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πŸ‘Ά Β Children (ELI5)

Hey, young explorers! Today, we're going on an incredible journey to the land of Elm. But what exactly is Elm, and why should we be so excited about it? Well, it's an exciting programming language that makes building web applications super enjoyable and fun. In this adventure, we'll learn all about Elm and uncover its amazing features, so buckle up and let's get started!

A Quick Introduction to Elm πŸŽ‰

Elm is a programming language designed specifically for creating awesome web applications. It compiles into JavaScript, which means your Elm code can be run in any web browser. But don't worry if you've never heard of JavaScript or programming languages before -- that's what we're here to explore!

The fantastic thing about Elm is that it helps us avoid many common bugs and errors that programmers might face when writing code. Imagine if, while building a sandcastle, some of your sand towers would crumble at random . Elm makes sure that our digital sandcastles stay strong and steady!

The Elm Magic: Type System πŸ§™β€β™‚οΈπŸ“š

One of the secrets behind Elm's ability to prevent errors is its powerful type system. Think of types like colors for painting: red, blue, and yellow are all different colors, and you can't mix them without creating a new color (like green or purple). Similarly, types in Elm help us tell the difference between different kinds of information, like numbers, words, and even pictures!

For example, let's say you want to send an invitation for your birthday party to your friends. Would you write their names with frosting on a cake or use a piece of paper with ink? In the world of programming, types help us make sure we use the right tools for the job -- like choosing paper and ink for writing invitations!

Let's take a peek at Elm's type system with a simple example:

greet : String -> String
greet name =
    "Hello, " ++ name ++ "!"

In this example, we created a greet function that takes a name (a word or String) and returns a new word with a friendly greeting. The : String -> String part of the code is how we tell Elm about the types we're using, kind of like saying: "Hey Elm, we plan on using words here, not numbers or anything else, okay?"

Elm's Safety Features: Compiler πŸ’ΌπŸ”’

Elm is like a helpful guide, ensuring that we don't make mistakes when coding by using a powerful tool called a compiler. Think of the compiler as a helpful robot that checks your work and makes sure it doesn't have any errors before sending it off to be run in the web browser.

When the Elm compiler finds something wrong in our code, it doesn't just give up. Instead, it offers helpful advice on how to fix the issue and make our code better! It's like having a helpful teacher looking over your shoulder while you're working on a school project.

Building Colorful Applications with Elm: The Elm Architecture πŸ—οΈπŸŒˆ

Enough with the basics! Let's talk about how we can use Elm to create amazing web applications that look and feel like magic. One of the coolest things about Elm is that it comes with built-in blueprints for building applications. These blueprints are called The Elm Architecture, and they give us an easy-to-follow structure for organizing our code.

The Elm Architecture is built up of three parts:

  1. Model : The model is like a treasure chest that stores all the information our application needs.
  2. Update : The update is like a machine that can change the contents of our treasure chest.
  3. View : The view is like an artist that can paint a beautiful picture of what's inside our treasure chest.

These three pieces work together to create applications that make users say, "Wow, this is awesome!"

Here's a quick example of how we could use the Elm Architecture to create a simple counter application:


type alias Model = Int

init : Model
init =


type Msg
    = Increment
    | Decrement

update : Msg -> Model -> Model
update msg model =
    case msg of
        Increment ->
            model + 1

        Decrement ->
            model - 1


view : Model -> Html Msg
view model =
    div []
        [ button [ onClick Decrement ] [ text "-" ]
        , div [] [ text (String.fromInt model) ]
        , button [ onClick Increment ] [ text "+" ]

In this example, our model is a simple number (the counter value), the update function describes how we can change the counter (by incrementing or decrementing it), and the view function paints a picture of the counter with two buttons to control it.

A World of Possibilities: Elm Packages 🎁🌎

The Elm programming language offers an incredible universe of packages, which are kind of like pieces of code that other people have written and shared with the world. You can think of packages as tools or toys in a giant shared toy box -- you can pick and choose which ones you want to play with and use in building your own incredible creations!

Some popular Elm packages include:

  • elm/html : This package lets us create and manipulate HTML elements, which are the building blocks of web pages.
  • elm/http : This package allows our applications to talk to servers and fetch information from the internet.
  • elm/svg : This package helps us draw amazing graphics, like charts, diagrams, and illustrations.

And there are many more! Elm packages open up a world of possibilities for us to build exciting and interactive web applications.

So, Are You Ready to Elm? πŸ˜„πŸŒ³

We've just scratched the surface of Elm's fantastic world in this journey, and there's so much more to explore! But now, you know some of the basics about Elm and why it's such a fun and powerful programming language.

Remember, Elm is like a helpful guide and friend that makes it easier and more enjoyable to create amazing web applications, while minimizing the chances of making mistakes. With its powerful type system, friendly compiler, easy-to-follow architecture, and a vast universe of packages, Elm opens up a world of possibilities for you to become a bold explorer of all things web!

So, young adventurers: are you ready to set forth into the magical world of Elm? Let the journey begin! is a collection of articles on a variety of technology and programming articles assembled by James Padolsey. Enjoy! And please share! And if you feel like you can donate here so I can create more free content for you.