v1.8.10
  • Solutions
    • Multiplatform
    • Server-side
    • Data science
    • Android
  • Docs
  • Community
  • Teach
  • Play
    • Playground
    • Hands-on
    • Examples
    • Koans
← Docs
kotlin-stdlib / kotlin.collections / HashMap / containsKey

containsKey

Common
1.0
fun containsKey(key: K): Boolean
(source)
JS
1.1
open fun containsKey(key: K): Boolean
(source)

Returns true if the map contains the specified key.

Stay in touch:
  • Contributing to Kotlin
  • Releases
  • Press Kit
  • Security
  • Blog
  • Issue Tracker
  • Brand assets
  • Careers
Kotlin™ is protected under the Kotlin Foundation and licensed under the Apache 2 license.
Supported and developed by JetBrains