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basvanmeurs/example.kt

Created February 11, 2021 09:53
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Kotlin Extension function with stateful property
Raw
example.kt
class TargetClass {} // External class to be extended
class Extra(var name: String = "")
val state = mutableMapOf<TargetClass, Extra>()
fun TargetClass.getState(): Extra {
 return state.getOrPut(this) { Extra() }
}
fun TargetClass.setName(v: String) {
 getState().name = v;
}
fun A.hello(v: String): String {
 return "hello ${getState().name}"
}
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