The Ultimate Guide to Kotlin Programming

Module 1: Kotlin Fundamentals & Setup

⏳ 1 week

• Topics: JVM vs. Android targets, Kotlin REPL, IntelliJ/Android Studio configuration

• Hands-on: Write basic Kotlin scripts demonstrating variables, control flow, and functions

Module 2: Null Safety & Type System

⏳ 1 week

• Topics: Nullable vs. non-nullable types, Elvis operator, safe calls, smart casts

• Hands-on: Refactor Java-style code to Kotlin, eliminating null pointer risks

Module 3: Functional Constructs & Collections

⏳ 1 week

• Topics: Lambdas, map/filter, sequences, immutable collections, scope functions (let, run)

• Hands-on: Process data streams with sequences and write concise collection pipelines

Module 4: Coroutines & Concurrency

⏳ 1 week

• Topics: suspend functions, launch vs. async, structured concurrency, channels, flows

• Hands-on: Build a simple concurrent downloader using coroutines and Flow for backpressure

Module 5: Object-Oriented & DSL Design

⏳ 1 week

• Topics: Classes, interfaces, delegation, sealed classes, type-safe builders, DSL patterns

• Hands-on: Create a mini-DSL for HTML generation and model a sealed-class hierarchy for API responses

Module 6: Android Development with Kotlin

⏳ 1 week

• Topics: Android KTX extensions, ViewBinding, lifecycle-aware coroutines, Jetpack Compose basics

• Hands-on: Develop a simple Compose screen fetching data via a coroutine and displaying it in a list

Module 7: Backend with Ktor & Serialization

⏳ 1 week

• Topics: Ktor server setup, routing, request/response, Kotlinx.serialization, dependency injection (Koin)

• Hands-on: Build a RESTful service with JSON endpoints and test it with HTTP clients

Module 8: Testing, Tooling & Best Practices

⏳ 1 week

• Topics: Unit vs. integration testing, MockK, Kotest, Gradle Kotlin DSL, code style enforcement

• Hands-on: Write test suites for Android ViewModel logic and Ktor routes, configure CI with Gradle

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