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 course, 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.
Course Material
- Notes about the course
- Project with exercises
- Quiz 13 attempts allowed
- Introduction
- What is Kotlin?
- Kotlin platforms
- The Kotlin IDE
- Where do we use Kotlin?
- Quiz 23 attempts allowed
- 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
- Quiz 4100 attempts allowed
- Variables
- Quiz 53 attempts allowed
- 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 63 attempts allowed
- Exercise: Basic values operations
- Quiz 7100 attempts allowed
- 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 83 attempts allowed
- Exercise: Using when
- Quiz 9100 attempts allowed
- Exercise: Pretty time display
- Quiz 10100 attempts allowed
- 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 113 attempts allowed
- Exercise: Person details display
- Quiz 12100 attempts allowed
- The power of the for-loop
- Ranges
- Break and continue
- Use cases
- Summary
- Quiz 133 attempts allowed
- Exercise: Range Operations
- Quiz 14100 attempts allowed
- Nullability
- Safe calls
- Not-null assertion
- Smart-casting
- The Elvis operator
- Extensions on nullable types
nullis our friend- lateinit
- Summary
- Quiz 153 attempts allowed
- Exercise: User Information Processor
- Quiz 16100 attempts allowed
- Classes
- Member functions
- Properties
- Constructors
- Classes representing data in Kotlin and Java
- Inner classes
- Summary
- Quiz 173 attempts allowed
- Exercise: Implementing the Product class
- Quiz 18100 attempts allowed
- Inheritance
- Overriding elements
- Parents with non-empty constructors
- Super call
- Abstract class
- Interfaces
- Visibility
Any- Summary
- Quiz 193 attempts allowed
- Exercise: GUI View Hierarchy Simulation
- Quiz 20100 attempts allowed
- 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 213 attempts allowed
- Exercise: Data class practice
- Quiz 22100 attempts allowed
- Objects
- Object expressions
- Object declaration
- Companion objects
- Data object declarations
- Constant values
- Summary
- Quiz 233 attempts allowed
- Exercise: Pizza factory
- Quiz 24100 attempts allowed
- 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 253 attempts allowed
- Exercise: Catching exceptions
- Quiz 26100 attempts allowed
- Enum classes
- Data in enum values
- Enum classes with custom methods
- Summary
- Quiz 273 attempts allowed
- Exercise: Days of the week enum
- Quiz 28100 attempts allowed
- Sealed classes and interfaces
- Sealed classes and
whenexpressions - Sealed vs enum
- Use cases
- Summary
- Quiz 293 attempts allowed
- Annotation classes
- Meta-annotations
- Annotating the primary constructor
- List literals
- Summary
- Quiz 303 attempts allowed
- Extensions
- Extension functions under the hood
- Extension properties
- Extensions vs members
- Extension functions on object declarations
- Member extension functions
- Use cases
- Summary
- Quiz 313 attempts allowed
- Exercise: Conversion and measurement unit creation
- Quiz 32100 attempts allowed
- 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 333 attempts allowed
- Exercise: Inventory management
- Quiz 34100 attempts allowed
- 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 353 attempts allowed
- Exercise: Money operations
- Quiz 36100 attempts allowed
- 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 373 attempts allowed
- Exercise: The closest supertype of types
- Quiz 38100 attempts allowed
- Generics
- Generic functions
- Generic classes
- Generic classes and nullability
- Generic interfaces
- Type parameters and inheritance
- Type erasure
- Generic constraints
- Star projection
- Underscore operator for type arguments
- Summary
- Quiz 393 attempts allowed
- Exercise: Stock
- Quiz 40100 attempts allowed
- Exercise solutions
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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