inline fun <K, V> Map<out K, V>.getOrDefault( key: K, defaultValue: V ): V
Platform and version requirements: Kotlin 1.2, JVM, JRE8
Returns the value to which the specified key is mapped, or defaultValue if this map contains no mapping for the key.
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Licensed under the Apache License, Version 2.0.
https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/get-or-default.html