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Free Lessons (4)
Getting Started
Introduction
Who's This Course for?
What's in this course?
Hello Kotlin
Introduction to Kotlin
Reasons to Love Kotlin
Why Should You Choose Kotlin?
Taking Kotlin for a Ride
Compile to Bytecode and Run
Compiling to Other Targets
Which Option to Choose?
Wrapping Up
Kotlin Essentials for the Java Eyes
Introduction to Kotlin Essentials
Less Typing
Sensible Warnings
Prefer val over var
Improved Equality Check
String Templates
Raw Strings
More Expressions, Fewer Statements
Wrapping Up
Working with Functions
Introduction to Functions in Kotlin
Creating Functions
Default and Named Arguments
vararg and Spread
Destructuring
Wrapping Up
External Iteration and Argument Matching
Introduction to External Iteration with Argument Matching
Range and Iteration
Iterating over Arrays and Lists
When It’s Time to Use when
Wrapping Up
Using Collections
Introduction to Collections in Kotlin
Flavors of Collections
Using Pair and Triple
Arrays of Objects and Primitives
Using List
Using Set
Using Map
Wrapping Up
Type Safety to Save the Day
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
Wrapping Up
Objects and Classes
Introduction to Objects and Classes
Objects and Singletons
Creating Classes
Companion Objects and Class Members
Creating Generics Classes
Data Classes
Wrapping Up
Class Hierarchies and Inheritance
Introduction to Class Hierarchies and Inheritance
Creating Interfaces and Abstract Classes
Nested and Inner Classes
Inheritance
Sealed Classes
Creating and Using Enums
Wrapping Up
Extension Through Delegation
Introduction to Delegation
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
Wrapping Up
Functional Programming with Lambdas
Introduction to Lambdas in Kotlin
The Functional Style
Lambda Expressions
Lambdas and Anonymous Functions
Closures and Lexical Scoping
Non-Local and Labeled return
Inlining Functions with Lambdas
Wrapping Up
Internal Iteration and Lazy Evaluation
Introduction to Internal Iteration and Lazy Evaluation
External vs. Internal Iterators
Internal Iterators
Sequences for Lazy Evaluation
Wrapping Up
Fluency in Kotlin
Introduction to Fluency in Kotlin
Overloading Operators
Injecting Using Extension Functions and Properties
Extending Functions
Function Fluency with infix
Fluency with Any Object
Implicit Receivers
Wrapping Up
Creating Internal DSLs
Introduction to DSLs in Kotlin
Types and Characteristics of DSLs
Kotlin for Internal DSLs
Challenges in Building for Fluency
Type-Safe Builders
Narrowing Access with Scope Control
Wrapping Up
Programming Recursion and Memoization
Introduction to Recursion and Memoization
The Power and Perils of Recursion
Tail Call Optimization
Memoization
Applying Memoization to Dynamic Programming
Wrapping Up
Exploring Coroutines
Introduction to Coroutines in Kotlin
Coroutines and Concurrency
Running Concurrently Using Coroutines
Coroutine Context and Threads
Debugging Coroutines
async and await
A Peek at Continuations
Creating Infinite Sequences
Wrapping Up
Asynchronous Programming
Introduction to Asynchronous Programming in Kotlin
Programming Asynchronously
Exception Handling
Cancellations and Timeouts
Wrapping Up
Intermixing Java and Kotlin
Introduction
Joint Compilation
Calling Java from Kotlin
Calling Kotlin from Java
Wrapping Up
Unit Testing with Kotlin
Introduction to Unit Testing in Kotlin
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
Wrapping Up
Programming Spring Applications with Kotlin
Introduction to Spring Applications in Kotlin
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
Wrapping Up
Writing Android Applications with Kotlin
Introduction to Android Applications in Kotlin
Creating a Project
Defining Domain Objects
Creating Layouts
Implementing the Activity
Updating the RecyclerView
Seeing the App in Action
Wrapping Up
Appendix
Transpiling to JavaScript
Kotlin/Native
Kotlin to WebAssembly
Project
Build a Ktor-Based Backend for a Financial App
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