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
- Defining function types
- Using function types
- Named parameters
- Type aliases
- A function type is an interface
- Quiz 23 attempts allowed
- Anonymous functions
- Quiz 33 attempts allowed
- 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
- Quiz 5100 attempts allowed
- Exercise: Observable value
- Quiz 6100 attempts allowed
- 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 73 attempts allowed
- Exercise: Inferred function types
- Quiz 8100 attempts allowed
- Exercise: Function references
- Quiz 9100 attempts allowed
- SAM Interface support in Kotlin
- Support for Java SAM interfaces in Kotlin
- Functional interfaces
- Quiz 103 attempts allowed
- 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 113 attempts allowed
- Exercise: Inline functions
- Quiz 12100 attempts allowed
- Collection processing
forEachandonEachfiltermapmapNotNullflatMap- Quiz 133 attempts allowed
- Exercise: Implement map
- Quiz 14100 attempts allowed
- Exercise: Optimize collection processing
- Quiz 15100 attempts allowed
foldfoldreducesum- Quiz 163 attempts allowed
withIndexand indexed variantswithIndexand indexed variants- Quiz 173 attempts allowed
take,takeLast,drop,dropLastandsubListtake,takeLast,drop,dropLastandsubList- Quiz 183 attempts allowed
- Exercise: Adding element at position
- Quiz 19100 attempts allowed
- Getting elements at certain positions
- Getting elements at certain positions
- Finding an element
- Counting elements
any,allandnone- Quiz 203 attempts allowed
- Exercise: Implement shop functions
- Quiz 21100 attempts allowed
partitionpartitiongroupBy- Quiz 223 attempts allowed
- Associating to a map
- Associating to a map
distinctanddistinctBy- Quiz 233 attempts allowed
- Exercise: Prime access list
- Quiz 24100 attempts allowed
- Sorting:
sorted,sortedByandsortedWith - Sorting:
sorted,sortedByandsortedWith - Sorting mutable collections
- Maximum and minimum
shuffledandrandom- Quiz 253 attempts allowed
- Exercise: Top articles
- Quiz 26100 attempts allowed
- Exercise: Refactor collection processing
- Quiz 27100 attempts allowed
zipandzipWithNextzipandzipWithNext- Windowing
- Quiz 283 attempts allowed
joinToStringjoinToStringMap,SetandStringprocessing- Quiz 293 attempts allowed
- Exercise: Passing students list
- Quiz 30100 attempts allowed
- Exercise: Best students list
- Quiz 31100 attempts allowed
- Exercise: Functional Quick Sort
- Quiz 32100 attempts allowed
- Exercise: Powerset
- Quiz 33100 attempts allowed
- Exercise: All possible partitions of a set
- Quiz 34100 attempts allowed
- 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 353 attempts allowed
- Exercise: Understanding sequences
- Quiz 36100 attempts allowed
- 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 373 attempts allowed
- Exercise: HTML table DSL
- Quiz 38100 attempts allowed
- Exercise: Creating user table row
- Quiz 39100 attempts allowed
- 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 403 attempts allowed
- Exercise: Using scope functions
- Quiz 41100 attempts allowed
- Exercise: orThrow
- Quiz 42100 attempts allowed
- Context receivers
- Extension function problems
- Introducing context receivers
- Use cases
- Classes with context receivers
- Concerns
- Summary
- Quiz 433 attempts allowed
- Exercise: Logger
- Quiz 44100 attempts allowed
- A birds-eye view of Arrow
- Functions and Arrow Core
- Functions and Arrow Core
- Memoization
- Testing higher-order functions
- Error Handling
- Error Handling
- Working with nullable types
- Working with Result
- Working with Either
- Data Immutability with Arrow Optics
- Data Immutability with Arrow Optics
- 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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