getOrDefault
Returns the value to which the specified key is mapped, or defaultValue if this map contains no mapping for the key.
inline fun <K, V> Map<out K, V>.getOrDefault(key: K, defaultValue: V): V(source)
fun main() {
val scores = mapOf("Alice" to 90, "Bob" to 75)
val charlieScore = scores.getOrDefault("Charlie", 0)
println("Charlie's score: $charlieScore") // prints: Charlie's score: 0
}