Mastering Kotlin Essentials

Module 1: Variables, Values & Types

⏳ 30 minutes

• Topics: val vs. var, primitive and nullable types, type inference

• Hands-on: Declare and use variables safely, handle nullable operations with ?. and ?:

Module 2: Control Flow & Null Safety

⏳ 45 minutes

• Topics: if expressions, when statements, loops (for, while), null-checks

• Hands-on: Write control-flow logic for a simple calculator and safely navigate nullable data

Module 3: Classes, Interfaces & Inheritance

⏳ 1 hour

• Topics: Primary/secondary constructors, inheritance modifiers, interfaces, abstract classes

• Hands-on: Model a vehicle hierarchy with shared behavior and polymorphic dispatch

Module 4: Advanced Class Types & Objects

⏳ 1 hour

• Topics: Data classes, sealed classes, enum classes, annotation classes, object declarations

• Hands-on: Create a sealed class hierarchy for API responses and use data classes for DTOs

Module 5: Functions & Extension Functions

⏳ 45 minutes

• Topics: Top-level functions, default and named parameters, extension functions, higher-order functions

• Hands-on: Write utility extensions for String and Collection to streamline common tasks

Module 6: Collections & Generics

⏳ 1 hour

• Topics: List/Set/Map APIs, lambdas, map/filter/reduce, variance, and generic functions/classes

• Hands-on: Process a list of user objects to filter, transform, and aggregate data

Module 7: Operator Overloading & DSLs

⏳ 30 minutes

• Topics: Overloading arithmetic, comparison, and invocation operators; building Kotlin DSLs

• Hands-on: Define a mini-DSL for HTML generation or mathematical expressions

Module 8: Exception Handling & Advanced Topics

⏳ 30 minutes

• Topics: try/catch/finally, custom exceptions, inline functions, reified type parameters

• Hands-on: Implement and handle custom error types in a file-processing utility

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