Kotlin Essentials (The Course)
This Course is part of the following Tracks:
Course Info
This course includes 1 attempt.
Kotlin is a powerful language, largely thanks to its expressive syntax, intuitive and null-safe type system, and great tooling support. In this book, we cover the essentials of Kotlin, so you can start developing with this amazing programming language. We show nearly everything you need to know in clear and executable code examples.
This course includes:
- 21 lessons
- 21 quizzes
- 17 coding exercises
Course Material
- Notes about the course
- Project with exercises
- Quiz 13 attempts allowed
- What is Kotlin?
- What is Kotlin?
- Kotlin platforms
- The Kotlin IDE
- Where do we use Kotlin?
- Quiz 23 attempts allowed
- Your first program in Kotlin
- Your first program in Kotlin
- Live templates
- What is under the hood on JVM?
- Packages and importing
- Summary
- Quiz 33 attempts allowed
- Exercise: Your first program
- Variables
- Variables
- Quiz 43 attempts allowed
- Basic types, their literals and operations
- Basic types, their literals and operations
- Numbers
- Underscores in numbers
- Other numeral systems
Numberand conversion functions- Operations on numbers
- Operations on bits
BigDecimalandBigInteger- Booleans
- Equality
- Boolean operations
- Characters
- Strings
- Summary
- Quiz 53 attempts allowed
- Exercise: Basic values operations
- Conditional statements: if, when, try, and while
- Conditional statements: if, when, try, and while
- if-statement
- when-statement
- when-statement with a value
- is check
- Explicit casting
- Smart-casting
- While and do-while statements
- Summary
- Quiz 63 attempts allowed
- Exercise: Using when
- Exercise: Pretty time display
- Functions
- Functions
- Single-expression functions
- Functions on all levels
- Parameters and arguments
Unitreturn type- Vararg parameters
- Named parameter syntax and default arguments
- Function overloading
- Infix syntax
- Function formatting
- Summary
- Quiz 73 attempts allowed
- Exercise: Person details display
- The power of the for-loop
- The power of the for-loop
- Ranges
- Break and continue
- Use cases
- Summary
- Quiz 83 attempts allowed
- Exercise: Range Operations
- Nullability
- Nullability
- Safe calls
- Not-null assertion
- Smart-casting
- The Elvis operator
- Extensions on nullable types
nullis our friend- lateinit
- Summary
- Quiz 93 attempts allowed
- Exercise: User Information Processor
- Classes
- Classes
- Member functions
- Properties
- Constructors
- Classes representing data in Kotlin and Java
- Inner classes
- Summary
- Quiz 103 attempts allowed
- Exercise: Implementing the Product class
- Inheritance
- Inheritance
- Overriding elements
- Parents with non-empty constructors
- Super call
- Abstract class
- Interfaces
- Visibility
Any- Summary
- Quiz 113 attempts allowed
- Exercise: GUI View Hierarchy Simulation
- Data classes
- Data classes
- Transforming to a string
- Objects equality
- Hash code
- Copying objects
- Destructuring
- When and how should we use destructuring?
- Data class limitations
- Prefer data classes instead of tuples
- Summary
- Quiz 123 attempts allowed
- Data class practice
- Objects
- Objects
- Object expressions
- Object declaration
- Companion objects
- Data object declarations
- Constant values
- Summary
- Quiz 133 attempts allowed
- Exercise: Pizza factory
- Exceptions
- Exceptions
- Throwing exceptions
- Defining exceptions
- Catching exceptions
- A try-catch block used as an expression
- The finally block
- Important exceptions
- The hierarchy of exceptions
- Summary
- Quiz 143 attempts allowed
- Exercise: Catching exceptions
- Enum classes
- Enum classes
- Data in enum values
- Enum classes with custom methods
- Summary
- Quiz 153 attempts allowed
- Exercise: Days of the week enum
- Sealed classes and interfaces
- Sealed classes and interfaces
- Sealed classes and
whenexpressions - Sealed vs enum
- Use cases
- Summary
- Quiz 163 attempts allowed
- Annotation classes
- Annotation classes
- Meta-annotations
- Annotating the primary constructor
- List literals
- Summary
- Quiz 173 attempts allowed
- Extensions
- Extensions
- Extension functions under the hood
- Extension properties
- Extensions vs members
- Extension functions on object declarations
- Member extension functions
- Use cases
- Summary
- Quiz 183 attempts allowed
- Exercise: Conversion and measurement unit creation
- Collections
- Collections
- The hierarchy of interfaces
- Mutable vs read-only types
- Creating collections
- Lists
- Modifying lists
- Checking a list’s size or if it is empty
- Lists and indices
- Checking if a list contains an element
- Iterating over a list
- Sets
- Modifying sets
- Elements in a set are unique
- Checking a set’s size or if it is empty
- Checking if a set contains an element
- Iterating over sets
- Maps
- Finding a value by a key
- Adding elements to a map
- Checking if a map contains a key
- Checking map size
- Iterating over maps
- Mutable maps
- Using arrays in practice
- Arrays of primitives
- Vararg parameters and array functions
- Summary
- Quiz 193 attempts allowed
- Exercise: Inventory management
- Operator overloading
- Operator overloading
- An example of operator overloading
- Arithmetic operators
- The
inoperator - The iterator operator
- The equality and inequality operators
- Comparison operators
- The indexed access operator
- Augmented assignments
- Unary prefix operators
- Increment and decrement
- The invoke operator
- Precedence
- Summary
- Quiz 203 attempts allowed
- Exercise: Money operations
- The beauty of Kotlin’s type system
- The beauty of Kotlin’s type system
- What is a type?
- Why do we have types?
- The relation between classes and types
- Class vs type in practice
- The relationship between types
- The subtype of all the types: Nothing
- The result type from return and throw
- When is some code not reachable?
- The type of null
- Summary
- Quiz 213 attempts allowed
- Practice: The closest supertype of types
- Generics
- Generics
- Generic functions
- Generic classes
- Generic classes and nullability
- Generic interfaces
- Type parameters and inheritance
- Type erasure
- Generic constraints
- Star projection
- Summary
- Quiz 223 attempts allowed
- Exercise: Stock
Instructors
Marcin Moskala is an experienced developer and Kotlin trainer. He is the founder of the Kt. Academy, Kotlin GDE, an official JetBrains partner for teaching Kotlin, and author of the books Effective Kotlin, Kotlin Coroutines, and Android Development with Kotlin.
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