🚀 Let's start

Prerequisites

Basic knowledge of kotlin development (nullability,inline & lambda functions mainly). For more information, please refer to the Worldline kotlin training
Android Studio IDE is the dedicated IDE to consider for KMP developpement.
A good connectivity

Advanced installation

For more information about your DEV environment and installs please have a look to jetbrain related docs

Consider also installing Jetbrain ToolBox for managing multiple versions ( Beta , Alpha , stable) of Android Studio or Fleet

What is Functional Programming?

Definition:

FP uses an approach to software development that uses pure functions to create maintainable software
It uses immutable functions and avoids shared states.
It is in contrast to object-oriented programming languages which uses mutable states
It focuses on results and not process, while the iterations like for loops are not allowed

Advantages: Problems are easy Keeps concurrency safe

let numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

// Step 1: Filter out even numbers
let oddNumbers = numbers. filter { $0 % 2 != 0 }

// Step 2: Square each of the remaining numbers
let squaredNumbers = oddNumbers.map { $0 * $0 }

// Step 3: Sum up all the squared numbers
let sumOfSquares =squaredNumbers.reduce(0, +)

print("The sum of squares of odd numbers is \(sumOfSquares)")
//output: The sum of squares of odd numbers is 165

Filter: filters array to include only odd numbers Map: squares the numbers Reduce: sums up the squared numbers

This example demonstrates the core principles of functional programming: using functions as first-class citizens to transform and compose data in a clear and concise way.

a Startup screen explaining rules of the game
a Quiz screen looping on single choices questions
a final scoring screen.

Technically

The app can be deployed on Android , iOS and jvm Desktop.
We will use not only a common library but composable views shared for all platforms

Design screens

Here are expected screens at the end of this Hands-on Lab.

screens

Generate composables based on designs

You can generate composables based on designs on Figma thanks to the plugin Google Relay. A dedicated section on android developer documentation describe all the steps here

🚀 Let's start

Prerequisites

What is Functional Programming?

Apps using KMP

KMP roadmap

Hands-on Lab objectives

Functionnally

Technically

Design screens

See also