Kotlin Assignments & Projects

Course: SE 3242 – Android Application Development
Institution: ICT University, Cameroon
Student: Fanyi Charllson
Collaborator: Adrien Tello

---

Repository Overview

This repository contains a collection of Kotlin programming exercises and projects developed as part of the Android Application Development course.

The goal of these exercises is to demonstrate understanding of:

• Kotlin syntax and functional programming
• Higher-order functions and lambdas
• Collection transformations
• Data processing with Kotlin collections
• Desktop application development using Kotlin
• Android development concepts

Each assignment focuses on specific concepts used in modern Kotlin and Android development.

---

Projects and Exercises

1. Grade Calculator Desktop Application

Overview

A Kotlin Multiplatform Desktop Application (JVM) built with modern UI principles to calculate student grades.

The application allows instructors or students to:

• Import student scores from Excel files
• Automatically calculate grades
• Apply the ICT University grading scale
• Export results for reporting

Key Features

• Excel data import
• Automatic grade calculation
• User-friendly desktop interface
• Exportable results

Technologies Used

• Kotlin JVM
• Desktop UI architecture
• Data processing logic

Purpose

This project demonstrates how Kotlin can be used to build real-world desktop applications for academic environments.

---

2. Kotlin Basics – Exercise One

Topic: Lambdas & Higher-Order Functions

Objective

Implement a higher-order function called processList that accepts:

• a list of integers
• a lambda predicate

The function returns only the elements that satisfy the condition.

---

Concepts Demonstrated

Higher-Order Functions

A higher-order function is a function that takes another function as a parameter.

fun processList(list: List<Int>, predicate: (Int) -> Boolean): List<Int>

Lambda Expressions

Lambda expressions allow functions to be passed as arguments.

processList(nums) { it % 2 == 0 }

Kotlin filter

Internally this logic behaves similarly to Kotlin's built-in filter function.

---

Example

Input list:

[1, 2, 3, 4, 5, 6]

Predicate:

it % 2 == 0

Output:

[2, 4, 6]

---

Key Takeaway

This exercise demonstrates how higher-order functions and lambdas enable flexible and reusable code in Kotlin.

---

3. Kotlin Basics – Exercise Two

Topic: Collections & Functional Transformations

Objective

Transform a list of strings into a Map where:

• the key is the word
• the value is the length of the word

Then print only entries where the length is greater than 4.

---

Concepts Demonstrated

associateWith()

Converts a list into a map where each element becomes a key.

words.associateWith { it.length }

Example result:

Word	Length
apple	5
cat	3
banana	6

---

Map Filtering

Filtering map entries using Kotlin's filter.

filter { it.value > 4 }

---

Expected Output

apple has length 5
banana has length 6
elephant has length 8

---

Key Takeaway

Kotlin collections provide powerful transformation functions that make data processing concise and expressive.

---

4. Kotlin Basics – Exercise Three

Topic: Data Classes & Collection Processing

Objective

Calculate the average age of people whose names start with A or B from a list of Person objects.

---

Data Model

data class Person(val name: String, val age: Int)

---

Processing Pipeline

Start list
   ↓
Filter names starting with A or B
   ↓
Extract ages
   ↓
Compute average
   ↓
Format output

---

Example Data

Alice/25
Bob/30
Charlie/35
Anna/22
Ben/28

Filtered:

Alice, Bob, Anna, Ben

Average age:

26.3

---

Key Takeaway

This exercise demonstrates how Kotlin's collection operations (filter, map, average) enable clean and readable data processing pipelines.

---

5. ICTU Exchange – Course Project

Overview

ICTU Exchange is a conceptual Android marketplace designed specifically for students of The ICT University, Cameroon.

The platform enables students to:

• Buy and sell academic resources
• Exchange electronics and study materials
• Connect within a trusted campus marketplace

---

Problem Addressed

Students often struggle with:

• High cost of academic materials
• Limited access to reliable online marketplaces
• Poor internet connectivity

---

Solution

ICTU Exchange introduces:

• A student-only digital marketplace
• Offline-first application design
• Integration with device sensors for enhanced functionality

---

Project Goal

The goal of this project is to explore how Android applications can solve real campus problems using modern mobile development practices.

---

Repository Structure

kotlin-assignments-projects
│
├── grade-calculator-desktop-app
├── kotlin-basics-exercise-one
├── kotlin-basics-exercise-two
├── kotlin-basics-exercise-three
└── ictu-exchange

Each folder contains the implementation for a specific assignment or project.

---

Collaboration Workflow

This repository follows a collaborative development workflow using:

• Git branches
• Pull Requests
• Code Reviews

Each feature or assignment is developed in a separate branch and merged through Pull Requests after review.

This workflow simulates real-world software development practices used in professional teams.

---

Authors

Fanyi Charllson
Software Developer | Android & Backend Development

Adrien Tello
Collaborator – Code Review & Project Contributions

---

License

This repository is intended for educational purposes as part of coursework at ICT University.