open fun put(key: K, value: V): V?
Platform and version requirements: JS
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.
© 2010–2017 JetBrains s.r.o.
Licensed under the Apache License, Version 2.0.
https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/-hash-map/put.html