containsKey

kotlin-stdlib / kotlin.collections / HashMap / containsKey

Platform and version requirements:

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.

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https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/-hash-map/contains-key.html