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Kotlin
Intermediate Programming Languages

Kotlin

Google's preferred language for Android. Modern, concise, and fully interoperable with Java. Includes Coroutines and Jetpack basics.

5 modules 13 lessons 5 h 750 questions
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Course content

1 Kotlin Fundamentals 3 lessons · 21 min
1 Introduction to Kotlin 6:54 2 Null Safety 6:56 3 Control Flow 6:57
Practice · 0 of 50 questions Practice →
2 Functions & Extensions 3 lessons · 20 min
4 Functions 7:16 5 Lambdas & Higher-Order Functions 6:43 9 Extension Functions & Properties 6:21
Practice · 0 of 50 questions Practice →
3 OOP & Sealed Classes 4 lessons · 26 min
6 Classes & Data Classes 6:30 7 Sealed Classes, Enums & When 6:46 10 Generics & Type System 6:38 11 Object, Companion Object & Interfaces 6:19
Practice · 0 of 50 questions Practice →
4 Collections & Sequences 1 lesson · 7 min
8 Collections 6:41
Practice · 0 of 50 questions Practice →
5 Coroutines & Android 2 lessons · 15 min
12 Coroutines Basics 6:58 13 Coroutines: Flow & StateFlow 7:50
Practice · 0 of 50 questions Practice →

Tips

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Collections Turn a list into a lookup Map with associateBy associateBy and associateWith skip the manual index-building loop Collections Build immutable collections with buildList and buildMap Get a mutable scratchpad that freezes into a read-only result Collections Reach for groupBy and partition before hand-rolled loops Bucketing collections rarely needs a manual for-loop Collections Switch to Sequence when chaining operations on big collections Sequences process element-by-element instead of pass-by-pass