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kotlin-fundamentals

Kotlin language fundamentals - syntax, null safety, data classes, extensions

$ Installer

git clone https://github.com/pluginagentmarketplace/custom-plugin-kotlin /tmp/custom-plugin-kotlin && cp -r /tmp/custom-plugin-kotlin/skills/kotlin-fundamentals ~/.claude/skills/custom-plugin-kotlin

// tip: Run this command in your terminal to install the skill

SKILL.md

View on GitHub →

name: kotlin-fundamentals description: Kotlin language fundamentals - syntax, null safety, data classes, extensions version: "1.0.0" sasmp_version: "1.3.0" bonded_agent: 01-kotlin-fundamentals bond_type: PRIMARY_BOND

execution: timeout_ms: 30000 retry: max_attempts: 3 backoff: exponential initial_delay_ms: 1000

logging: level: info events: [skill_invoked, topic_loaded, error_occurred]

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")