Kotlin

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Last Update	09/16/2026
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Section 1: Getting Started

3Lessons ·
- 3: Running Kotlin Scripts vs Compiled Programs
  
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Section 2: Core Syntax

8Lessons ·
- 4: Variables: val and var
  
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Section 3: Null Safety

5Lessons ·
- 12: Nullable Types
  
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Section 4: Object-Oriented Kotlin

8Lessons ·
- 18: Primary and Secondary Constructors
  
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- 23: Visibility Modifiers
  
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Section 5: Functional Kotlin

6Lessons ·
- 25: Lambda Expressions and Higher-Order Functions
  
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- 28: Collections and Sequence Operations
  
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Section 6: Coroutines

7Lessons ·
- 31: Introduction to Coroutines
  
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Section 7: Collections Deep Dive

5Lessons ·
- 40: Sequences vs Collections: Lazy Evaluation
  
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Section 8: Type System Deep Dive

5Lessons ·
- 43: Type Aliases
  
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Section 9: Interop and Tooling

4Lessons ·
- 48: Calling Java from Kotlin and Vice Versa
  
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- 49: Building with Gradle Kotlin DSL
  
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Section 13: Practical Projects

5Lessons ·
- 63: Building a Command-Line Application in Kotlin
  
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Section 14: Interview Practice

3Lessons ·
- 70: Comparing Kotlin Idioms to Java Equivalents
  
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Section 15: More Practice Exercises

4Lessons ·
- 71: Practice Exercise: Building a Class-Based To-Do List
  
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- 72: Practice Exercise: Building a Coroutine-Based Data Fetcher
  
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- 73: Practice Exercise: Building a Simple DSL for HTML Generation
  
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Section 16: More Standard Library

4Lessons ·
- 76: Working with Regular Expressions in Kotlin
  
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Section 18: kotlin.collections In Depth

6Lessons ·
- 82: List Operations: map, filter, fold In Depth
  
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- 85: MutableList vs List Semantics
  
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Section 19: kotlin.text In Depth

4Lessons ·
- 89: String Extension Functions: trim, padStart, chunked
  
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Section 20: kotlin.ranges and kotlin.sequences

4Lessons ·
- 95: Infinite Sequences with generateSequence
  
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Section 21: kotlin.io and File Handling

3Lessons ·
- 96: Reading Files with kotlin.io Extensions
  
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Section 22: kotlinx.coroutines Deep Dive

7Lessons ·
- 102: Channels for Coroutine Communication
  
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Section 26: Kotlin for Backend Deep Dive

6Lessons ·
- 121: Building a GraphQL Server with Kotlin
  
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Section 28: Advanced Language Features

7Lessons ·
- 134: Value Classes and Inline Classes Revisited
  
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Section 30: More Interview Practice

4Lessons ·
- 143: Timed Mock Assessment on Core Kotlin
  
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Section 31: Kotlin Type System Deep Dive

6Lessons ·
- 144: Nothing Type and Its Uses
  
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- 145: Unit Type vs Void
  
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- 146: Star Projections in Generics
  
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Section 32: Kotlin Null Safety Advanced

4Lessons ·
- 150: Nullability Annotations for Java Interop
  
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- 151: Handling Platform Types Safely
  
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- 153: Null Safety in Collections
  
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Section 34: Kotlin Build Tooling Deep Dive

4Lessons ·
- 162: Kotlin Compiler Plugins Overview
  
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Section 35: Kotlin Serialization

4Lessons ·
- 165: Polymorphic Serialization
  
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Section 37: Kotlin Native Overview

4Lessons ·
- 174: Memory Management in Kotlin/Native
  
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Section 43: Kotlin Language Evolution

4Lessons ·
- 198: What's New in Recent Kotlin Versions
  
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- 200: Context Receivers (Experimental Feature)
  
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Section 45: Kotlin Delegation Patterns Deep Dive

4Lessons ·
- 211: Property Delegation: Custom Delegate Classes
  
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Section 46: Kotlin Annotations Deep Dive

4Lessons ·
- 216: Retention Policies for Custom Annotations
  
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Section 48: Kotlin Concurrency Beyond Coroutines

3Lessons ·
- 222: Atomic Types from Kotlin
  
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Section 51: Final Practice Projects

6Lessons ·
- 234: Building a Simple Job Scheduler with Coroutines
  
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Section 53: More Practice and Drills

5Lessons ·
- 242: Practice Exercise: Building a Kotlin-Based Configuration DSL
  
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