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set

kotlin-stdlib / kotlin.collections / set
Platform and version requirements: JVM (1.0), JS (1.0), Native (1.0) 
operator fun <K, V> MutableMap<K, V>.set(key: K, value: V)

Allows to use the index operator for storing values in a mutable map.

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Licensed under the Apache License, Version 2.0.
https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/set.html