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jraska/LazyMap.kt

Created May 28, 2019 23:50
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LazyMap.kt
fun <K, V> lazyMap(initializer: (K) -> V): Map<K, V> {
val map = mutableMapOf<K, V>()
return map.withDefault { key ->
val newValue = initializer(key)
map[key] = newValue
return@withDefault newValue
}
}
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