Shows examples of and explains different features of the Kotlin programming language

• Access modifiers
  • internal, private, protected, public
• Callbacks
  • synchronous
  • asynchronous with anonymous class
  • asynchronous with closure
• Class types
  • abstract, data, enum
  • inheritance
    • delegation, composition, downcasting, inheritance, polymorphism, upcasting
  • interface (not a class)
• Constructors
  • init, secondary constructor
  • command line, default, fixed, mutable, named, non-accessible, and vararg arguments
  • overloading
• Containers
  • arrays
  • destructuring declarations
  • lists, mutableLists
    • add, all, any, chunked, compareBy, count, distinct, drop, dropLast, dropWhile,
    • filter, filterIndexed, filterNot, filterNotNull, find, flatMap, flatten, fold,
    • forEach, getOrNull, joinToString, map, mapIndexed, minByOrNull, none, partition,
    • reduce, reversed, slice, sorted, sortedBy, sortedByDescending, sortWith, sum,
    • take, takeLast, takeLastWhile, zip, zipWithNext
  • maps
    • entries, filterKeys, filterValues, get, getOrDefault, getOrElse, getOrPut,
    • getValue, keys, map, mapKeys, mapValues, values, withDefault
  • sets
    • intersect, setOf, subtract, union
• Coroutines
  • exception handler
    • uncaught exceptions propagate
    • caught exceptions
    • cancelled coroutines
    • coroutine suspension
  • flow
    • collecting flows, collecting and consuming channels
    • mapping flows, changing flow context
    • bad and good error handling
  • recursive functions
  • sharedFlow
  • stateFlow
• Data types
  • Byte, Short, Int, Long, Float, Double, Boolean, Char, String
  • extension properties
  • generic types, nullables, strings
• Expressions
  • if / else, in, repeat, when
• Functions
  • scope functions: also, apply, let, run, with
  • anonymous/lambda, extension, generic, parameter, recursion, returned, and variable functions
• Loops
  • break / continue, do while, for, labels, while
• Operators
  • assignment
    • +=, -=, *=, /=, %=
    • ++, --
  • logical
    • ==, !=, <, >, <=, >=, &&, ||
  • mathematical
    • +, -, *, /, %
  • null safety
    • !!, ?., ?:
  • end of declaration: ;, range: .., type declaration: :, label: @,
  • lambda / when: ->, parameter substitution: _, reference: ::
• Property accessors: get / set
• Sequences
  • eager vs lazy evaluation
  • generating sequences
  • intermediate vs terminal operations
• Serializable / JSON parsing
• Statements: for