Write down a plan

slides/content/01-kotlin/_index.md

@@ -68,21 +68,33 @@ Similar to Scala. The keyword `def` is replaced by `fun`
 val x = 10 // constant
 var y = 20 // variable, can be reassigned
 fun foo() = 20 // function definition, single expression
-fun foo() { // same as above with multiple expression
-    return 20 // requires return in this form
+fun bar(): Int { // same as above with multiple expression
+    return 20 // requires a return in this form...
 }
+fun baz() { } // Unless it returns Unit
+
 ```
 
 ---
 
 # Kotlin 101
-## Function parameters, return types
+## Function parameters and return types
 
 Much like Scala:
 
+* All parameters are named, but can be invoked positionally as well
+* Parameters can have defaults
+* Types are annotatedd after the parameter name
+* Invocation can be positional or by name, with the rule that once a named parameter is used, subsequent parameters must be named as well
+
 ```kotlin
-fun foo(): Int = 10 // types are annotated with a column and the type name
-fun foo() = 10 // return type annotation can be omitted (if the compiler can infer it)
+fun foo(a: Int, b: String): Int = TODO() // TODO() is a builtin
+// MANCANO I DEFAULT!!!!
+function throwing a `NotImplementedError`
+foo(1, "bar") // OK, positional
+foo(a = 1, b = "bar") // OK, named
+foo(1, b = "bar") // OK, hybrid
+foo(a = 1, "bar") // error: no value passed for parameter 'b'
 ```
 
 ---
@@ -129,4 +141,144 @@ fun main(arguments: Array<String>) = println("Hello World") // Valid entry point
 fun main(arguments: Array<String>) {
     println("Hello World") // Return type is Unit, no need to return
 } 
-```
+```
+
+---
+
+# Kotlin 101
+## Program entry point
+
+
+---
+
+# TODOS
+
+## 101
+type hierarchy (top and bottom types)
+nullable types
+boolean types
+numeric types
+unsigned integers
+string templates
+multiline strings
+packages and imports
+compile time constants
+varargs
+infix
+local functions
+inline functions
+
+## flow control
+if
+for
+while
+break and continue
+when vs. pattern matching
+labeled jumping (incl. qualified return)
+
+## oop
+classes and members (methods and properties)
+object creation (no new)
+access to members (invoke vs named access)
+inheritance and open
+inheritance and override
+abstract
+inheritance and disambiguation by `super<Class>`
+interfaces and subtyping
+implementation of members in interfaces (no backing field)
+constructors
+init blocks
+secondary constructors
+nullability and `lateinit`
+getters
+setters
+accessors in interfaces
+backing fields, `field`
+objects
+companion objects
+visibility
+controlling visibility of properties (`private set`)
+equality / hashing / toString
+
+## generics
+syntax for functions
+syntax for classes
+type bounds
+`where`
+variance
+use site variance and type projection
+declaration site variance
+star-projection
+reified types
+invocation of reified types
+
+## basic collections?
+list / mutablelist
+set / mutableset
+map / mutablemap
+`in`
+
+## extended OOP
+data classes
+copy / equals / toString
+destructuring declarations
+Pair / Triple
+sealed classes
+sealing and when
+nested classes
+inner classes
+enum classes
+anonymous classes via object expression
+type aliasing
+delegation and `by`
+contract implementation by delegation (favor composition over inheritance)
+delegated properties and variables
+delegated properties https://kotlinlang.org/docs/reference/delegated-properties.html
+lazy
+observable
+delegation via map (mutability via MutableMap)
+implementing a custom delegate for properties
+
+## functional kotlin
+function types
+function types and nullability
+lambda expressions
+trailing lambdas
+implicit single parameters
+closures
+destructuring in lambdas
+anonymous functions (rarely used)
+invoke convention
+inline functions
+
+## extensions
+extension functions vs implicits
+extension properties (no backing field)
+nullable receivers
+companion extensions
+generic extensions
+extensions resolution
+extension members (scope control)
+visibility of private members
+
+## extensions + functional
+function types with receiver
+
+## standard library
+let / run / apply / with
+arrays
+primitive arrays
+ranges
+
+## performance
+tail recursion
+inline functions
+noinline
+crossinline
+inline classes -- mentioned and skipped, ref to https://kotlinlang.org/docs/reference/inline-classes.html
+
+## java interop
+@JvmOverloads
+@JvmDefault
+
+## DSLs in Kotlin (type-safe builders)