All 30 days
Day 26 / 30 · 2025 Edition
Advanced Kotlin Features
Inline functions, delegation, DSLs, reflection and designing Kotlin frameworks and libraries.
Inside this day
Questions and detailed answers at four levels — Junior, Mid, Senior and Architect — with code samples and architect's insights.
Try answering each question out loud before you read the answer — that's the closest thing to a real interview.