Kotlin + KMP

What’s inside

• Foundations — vals and vars, null safety, types, control flow as expressions, and the functions that make Kotlin concise
• Functions & Lambdas — higher-order functions, lambdas, and the five scope functions (let, run, with, apply, also) used the way pros use them
• The Object Model — data classes, sealed types, delegation, generics with variance, and operator overloading
• Concurrency — coroutines, suspend functions, launch and async, structured scopes, and Flow for streams of values
• Robustness & Ecosystem — Result and runCatching, the standard library, and seamless Java interop
• Kotlin Multiplatform (KMP) — expect/actual declarations, Ktor, SQLDelight, Compose Multiplatform, iOS and Swift interop, XCFramework packaging, and a four-platform capstone
• "Try Every Possibility" code, trap-annotated — idioms and the famous traps marked // BROKEN: and // ILLEGAL:, so you meet them in safety first
• A practice challenge + a harder bonus in every chapter — with hidden solutions and a dedicated Challenge Answers chapter
• 5 Capstone Projects — TaskTrek, WordWeave, LogPulse, CalcStack, and GrepLite