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Introduction to Kotlin Essentials

Kotlin Essentials for the Java Eyes

9 Lessons

Work your way through Kotlin's concise syntax, type inference, string templates, and immutability.

Less Typing

Sensible Warnings

Prefer val over var

Improved Equality Check

String Templates

Raw Strings

More Expressions, Fewer Statements

Introduction to Functions in Kotlin

Working with Functions

6 Lessons

Grasp the fundamentals of Kotlin functions, flexibility with arguments, and enhanced code readability.

Creating Functions

Default and Named Arguments

vararg and Spread

Destructuring

Introduction to External Iteration with Argument Matching

External Iteration and Argument Matching

5 Lessons

Take a closer look at Kotlin's iteration methods, collections interaction, and `when` expressions for efficient control flow.

Range and Iteration

Iterating over Arrays and Lists

When It’s Time to Use when

Introduction to Collections in Kotlin

Using Collections

8 Lessons

Simplify complex topics in Kotlin collections, enhancing safety and functional programming.

Flavors of Collections

Using Pair and Triple

Arrays of Objects and Primitives

Type Safety to Save the Day

8 Lessons

Approach type safety in Kotlin through null checks, smart casting, and generics.

Introduction to Type Safety in Kotlin

Any and Nothing Classes

Nullable References

Type Checking and Casting

Explicit Type Casting

Generics: Variance and Constraints of Parametric Types

Reified Type Parameters

Introduction to Objects and Classes

Objects and Classes

7 Lessons

Learn how to use Kotlin's streamlined object-oriented features and efficient class creation techniques.

Objects and Singletons

Creating Classes

Companion Objects and Class Members

Creating Generics Classes

Data Classes

Introduction to Class Hierarchies and Inheritance

Class Hierarchies and Inheritance

7 Lessons

Discover the logic behind Kotlin's intricate class hierarchies, inheritance, and design principles.

Creating Interfaces and Abstract Classes

Nested and Inner Classes

Inheritance

Sealed Classes

Creating and Using Enums

Introduction to Delegation

10.

Extension Through Delegation

9 Lessons

Examine Kotlin's delegation for adaptable design, code reuse, and robust property management.

When to Choose Delegation over Inheritance?

Designing with Delegates

Delegating to a Parameter

Dealing with Method Collisions

Caveats of Kotlin Delegation

Delegating Variables and Properties

Built-in Standard Delegates

Introduction to Lambdas in Kotlin

11.

Functional Programming with Lambdas

8 Lessons

Find out about Kotlin's functional programming with lambdas, closures, and performance optimization.

The Functional Style

Lambda Expressions

Lambdas and Anonymous Functions

Closures and Lexical Scoping

Non-Local and Labeled return

Inlining Functions with Lambdas

Introduction to Internal Iteration and Lazy Evaluation

12.

Internal Iteration and Lazy Evaluation

5 Lessons

Deepen your knowledge of Kotlin's internal iteration, lazy evaluation, and performance optimization.

External vs. Internal Iterators

Internal Iterators

Sequences for Lazy Evaluation

Introduction to Fluency in Kotlin

13.

Fluency in Kotlin

8 Lessons

Focus on writing fluent, expressive Kotlin code using operator overloading, extension functions, infix notation, and versatile object methods.

Overloading Operators

Injecting Using Extension Functions and Properties

Extending Functions

Function Fluency with infix

Fluency with Any Object

Implicit Receivers

Introduction to DSLs in Kotlin

14.

Creating Internal DSLs

7 Lessons

Master the steps to design, enhance, and manage internal DSLs in Kotlin efficiently.

Types and Characteristics of DSLs

Kotlin for Internal DSLs

Challenges in Building for Fluency

Type-Safe Builders

Narrowing Access with Scope Control

Introduction to Recursion and Memoization

15.

Programming Recursion and Memoization

6 Lessons

Learn how to use recursion, tail call optimization, and memoization to enhance Kotlin performance.

The Power and Perils of Recursion

Tail Call Optimization

Memoization

Applying Memoization to Dynamic Programming

Introduction to Coroutines in Kotlin

16.

Exploring Coroutines

9 Lessons

Unpack the core of Kotlin's coroutines enhancing concurrency and asynchronous programming efficiency.

Coroutines and Concurrency

Running Concurrently Using Coroutines

Coroutine Context and Threads

Debugging Coroutines

async and await

A Peek at Continuations

Creating Infinite Sequences

Introduction to Asynchronous Programming in Kotlin

17.

Asynchronous Programming

5 Lessons

Examine asynchronous programming with Kotlin coroutines, focusing on concurrency, exception handling, and task management.

Programming Asynchronously

Exception Handling

Cancellations and Timeouts

18.

Intermixing Java and Kotlin

5 Lessons

Grasp the fundamentals of integrating Kotlin with Java through joint compilation and interoperability techniques.

Introduction

Joint Compilation

Calling Java from Kotlin

Calling Kotlin from Java

Introduction to Unit Testing in Kotlin

19.

Unit Testing with Kotlin

13 Lessons

Take a closer look at unit testing in Kotlin, from setup to advanced testing, tools, and integration.

The Code Under Test

Getting the Project Files

Starting with a Canary Test

Writing Empirical Tests

Writing Data-Driven Tests

Mocking Out Dependencies

Testing Top-Level Functions

Testing Coroutines and Asynchronous Calls

Integrating with the Service

Viewing the Code Coverage

Taking the App for a Drive

Introduction to Spring Applications in Kotlin

20.

Programming Spring Applications with Kotlin

9 Lessons

See how Kotlin and Spring streamline development, reduce code, and enhance maintainability.

Creating a Starter Project

Creating a Controller

Creating an Entity Class

Creating a Repository Interface

Creating a Service

Integrating the Service with Controller

Taking It for a Ride

Introduction to Android Applications in Kotlin

21.

Writing Android Applications with Kotlin

8 Lessons

Build on Kotlin's power to create Android apps, focusing on efficient and expressive development.

Creating a Project

Defining Domain Objects

Creating Layouts

Implementing the Activity

Updating the RecyclerView

Seeing the App in Action

Transpiling to JavaScript

22.

Appendix

3 Lessons

Learn how to use Kotlin for JavaScript, native platforms, and WebAssembly targets.

Kotlin/Native

Kotlin to WebAssembly

Course Author

The Pragmatic Programmers

Project

Build a Ktor-Based Backend for a Financial App

intermediate

2 hour

Project

Build a Ktor-Based Backend for a Financial App

Learn to build a Ktor backend for a financial app using MongoDB and write documentation for Swagger UI to integrate with the backend to facilitate testing.

intermediate

2 hours

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