pluginagentmarketplace/custom-plugin-kotlin
kotlin-fundamentals
Kotlin language fundamentals - syntax, null safety, data classes, extensions
First seen Jan 25, 2026
Installation
$
npx skills add pluginagentmarketplace/custom-plugin-kotlin --skill kotlin-fundamentals
SKILL.md
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")
