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put

kotlin-stdlib / kotlin.collections / HashMap / put
Platform and version requirements: Native (1.3) 
fun put(key: K, value: V): V?
Platform and version requirements: JS (1.1) 
open fun put(key: K, value: V): V?

Associates the specified value with the specified key in the map.

Return the previous value associated with the key, or null if the key was not present in the map.

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