Functional Kotlin (The Course)
This Course is part of the following Tracks:
Course Info
Course Material
- Notes about the course
- Project with exercises
- Quiz 13 attempts allowed
- Introduction to functional programming with Kotlin
- Why do we need to use functions as objects?
- Function types
- Function types
- Defining function types
- Using function types
- Named parameters
- Type aliases
- A function type is an interface
- Quiz 23 attempts allowed
- Anonymous functions
- Anonymous functions
- Quiz 33 attempts allowed
- Lambda expressions
- Lambda expressions
- Tricky braces
- Parameters
- Trailing lambdas
- Result values
- Lambda expression examples
- An implicit name for a single parameter
- Closures
- Lambda expressions vs anonymous functions
- Quiz 43 attempts allowed
- Exercise: Function types and literals
- Function references
- Function references
- Top-level functions references
- Method references
- Extension function references
- Method references and generic types
- Bounded function references
- Constructor references
- Bounded object declaration references
- Function overloading and references
- Property references
- Quiz 53 attempts allowed
- Exercise: Inferred function types
- Exercise: Function types and literals
- SAM Interface support in Kotlin
- SAM Interface support in Kotlin
- Support for Java SAM interfaces in Kotlin
- Functional interfaces
- Quiz 63 attempts allowed
- Inline functions
- Inline functions
- Inline functions
- Inline functions with functional parameters
- Non-local return
- Crossinline and noinline
- Reified type parameters
- Inline properties
- Costs of the inline modifier
- Using inline functions
- Quiz 73 attempts allowed
- Exercise: Inline functions
- Collection processing
- Collection processing
forEachandonEachfiltermapmapNotNullflatMap- Quiz 83 attempts allowed
- Exercise: Optimize collection processing
foldreducesum- Quiz 93 attempts allowed
withIndexand indexed variants- Quiz 103 attempts allowed
take,takeLast,drop,dropLastandsubList- Quiz 113 attempts allowed
- Exercise: Adding element at position
- Getting elements at certain positions
- Finding an element
- Counting elements
any,allandnone- Quiz 123 attempts allowed
- Exercise: Implement shop functions (hard)
partitiongroupBy- Quiz 133 attempts allowed
- Associating to a map
distinctanddistinctBy- Quiz 143 attempts allowed
- Exercise: Prime access list
- Sorting:
sorted,sortedByandsortedWith - Sorting mutable collections
- Maximum and minimum
shuffledandrandom- Quiz 153 attempts allowed
- Exercise: Refactor collection processing
zipandzipWithNext- Windowing
- Quiz 163 attempts allowed
joinToStringMap,SetandStringprocessing- Quiz 173 attempts allowed
- Exercise: Passing students list
- Exercise: Best students list (hard)
- Sequences
- Sequences
- What is a sequence?
- Order is important
- Sequences do the minimum number of operations
- Sequences can be infinite
- Sequences do not create collections at every processing step
- When aren’t sequences faster?
- What about Java streams?
- Kotlin Sequence debugging
- Summary
- Quiz 183 attempts allowed
- Exercise: Understanding sequences
- Type Safe DSL Builders
- Type Safe DSL Builders
- A function type with a receiver
- Simple DSL builders
- Using
apply - Simple DSL-like builders
- Multi-level DSLs
- DslMarker
- A more complex example
- When should we use DSLs?
- Summary
- Quiz 193 attempts allowed
- Exercise: HTML table DSL
- Exercise: Creating user table row
- Scope functions
- Scope functions
let- Mapping a single object
- The problem with member extension functions
- Moving an operation to the end of processing
- Dealing with nullability
alsotakeIfandtakeUnlessapply- The dangers of careless receiver overloading
withrun- Using scope functions
- Quiz 203 attempts allowed
- Exercise: Using scope functions
- Exercise: orThrow
- Context receivers
- Context receivers
- Extension function problems
- Introducing context receivers
- Use cases
- Classes with context receivers
- Concerns
- Summary
- Quiz 213 attempts allowed
- Exercise: Logger
- A birds-eye view of Arrow
- A birds-eye view of Arrow
- Functions and Arrow Core
- Memoization
- Testing higher-order functions
- Error Handling
- Working with nullable types
- Working with Result
- Working with Either
- Data Immutability with Arrow Optics
- Final words
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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