containsKey

kotlin-stdlib / kotlin.collections / HashMap / containsKey
Platform and version requirements: Native (1.3) 
fun containsKey(key: K): Boolean
Platform and version requirements: JS (1.1) 
open fun containsKey(key: K): Boolean

Returns true if the map contains the specified key.

© 2010–2020 JetBrains s.r.o. and Kotlin Programming Language contributors
Licensed under the Apache License, Version 2.0.
https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/-hash-map/contains-key.html