Stop Confusing groupBy and groupingBy in Kotlin: Clear Examples for Both | Kotlin Fundamentals - 43
In this video, we continue the Kotlin collections series by looking at how to group collection elements using groupBy and groupingBy.
You’ll learn the difference between these two functions, when to use each one, and how they behave with real examples. The video walks through grouping a list of people by nationality, by age-based conditions, and by the first letter of a name.
It also explains how groupBy returns a map, while groupingBy returns a grouping object that can be used with aggregate operations like eachCount. On top of that, the video covers value transformations with groupBy so you can create more readable keys such as major and minor instead of true and false.
Topics covered:
Kotlin groupBy
Kotlin groupingBy
Grouping collections by key
Using eachCount with groupingBy
Grouping by nationality, age, and first letter
Transforming grouped keys and values
Difference between groupBy and groupingBy
This is a practical Kotlin collections demo focused on understanding grouping functions clearly with examples.
#Kotlin #KotlinCollections #groupBy #groupingBy #Collections #Programming #JVM #SoftwareDevelopment #KotlinTutorial
00:00 - Kotlin Collections Grouping Overview
01:30 - groupBy Demo with Nationality
02:50 - Grouping by Age Conditions
03:50 - Grouping by First Letter
04:43 - groupingBy and eachCount Explained
06:16 - groupBy Transformations for Major and Minor
08:22 - Wrap-Up and Next Steps
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