set
fun <K, V> Map<K, V>.setDefault(defaultValue: (key: K) -> V): MapWithDefault<K, V>
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Create a new MapWithDefault from given map and for each unknown key, returns the value provided by defaultValue provider.
fun <K, V> MutableMap<K, V>.setDefault(defaultValue: (key: K) -> V): MutableMapWithDefault<K, V>
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Create a new MutableMapWithDefault from given map and for each unknown key, returns the value provided by defaultValue provider.