Kotlin Fundamentals Skill
Master Kotlin programming fundamentals with production-ready patterns.
Topics Covered
Null Safety
// Safe call + Elvis
val name = user?.name ?: "Anonymous"
// requireNotNull for validation
requireNotNull(user) { "User required" }
Data Classes
data class User(val id: Long, val name: String) {
init { require(name.isNotBlank()) }
}
Scope Functions
| Function | Context | Returns | Use Case |
|---|
let | it | Lambda result | Null-safe transforms |
apply | this | Same object | Object configuration |
run | this | Lambda result | Object scope + result |
also | it | Same object | Side effects |
Troubleshooting
| Issue | Resolution |
|---|
| NPE despite null check | Check platform types from Java |
| Smart cast fails | Use local variable or let |
Usage
Skill("kotlin-fundamentals")