Grouping collections
Where it sits
Learn first
Introduction to InterfacesFiltering elements in collectionAggregate operations on collectionsThis skill
Grouping collections
Leads to
SequencesJobs that need it
- Android Developercorelevel 3
What level 3 (Working) means
Uses it independently on the job. Level 4 (Strong): handles hard cases, reviews others.
Grouping collections: common questions
What is Grouping collections?
Grouping collections is a skill in kotlin, needed by 1 role on BootSelf.
Which jobs need Grouping collections?
Android Developer. Most ask for level 3 (Working): uses it independently on the job.
What should I learn before Grouping collections?
Introduction to Interfaces, Filtering elements in collection, Aggregate operations on collections.
How long does it take to learn Grouping collections?
The starting lesson, Grouping collections, takes about 15 minutes. Reaching the level a job asks for takes practice on top: BootSelf measures where you are and plans the rest.
How do I practise Grouping collections?
Check your readiness for free, then BootSelf builds a route and short daily learning loops: a little theory, checks on what you get wrong, then a small program.