Kotlin · Medium

Lesson 1 · On the house

Generics

Type params on classes/functions; constraints T : Comparable<T>.

Lesson 2

Variance

in/out, producer/consumer; why List is covariant.

Lesson 3

Reified and inline

inline fun + reified T; type checks at the call site.

Lesson 4

Delegated properties

by lazy, by Delegates.observable, custom ReadOnlyProperty.

Lesson 5

Operator overloading

operator fun plus, invoke, and convention names.

Lesson 6

Lambdas with receiver

DSL sketch: fun build(block: StringBuilder.() -> Unit).

Lesson 7

Coroutines basics

suspend, runBlocking, launch, async/await.

Lesson 8

Structured concurrency

coroutineScope, cancel, Job; why scopes matter.

Lesson 9

Flow basics

Cold flow { }, collect, map/filter on Flow.

Lesson 10

Medium capstone

Generics + sealed result + async in one small program.