containsValue

import kotlin.test.*
import java.util.*

fun main() { 
   //sampleStart 
   val map: Map<String, Int> = mapOf("x" to 1, "y" to 2)

// member containsValue is used
println("map.containsValue(1) is ${map.containsValue(1)}") // true

// extension containsValue is used when the argument type is a supertype of the map value type
println("map.containsValue(1 as Number) is ${map.containsValue(1 as Number)}") // true
println("map.containsValue(2 as Any) is ${map.containsValue(2 as Any)}") // true

println("map.containsValue(\"string\" as Any) is ${map.containsValue("string" as Any)}") // false

// map.containsValue("string") // cannot call extension when the argument type and the map value type are unrelated at all 
   //sampleEnd
}
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​
val map: Map<String, Int> = mapOf("x" to 1, "y" to 2)
​
// member containsValue is used
println("map.containsValue(1) is ${map.containsValue(1)}") // true
​
// extension containsValue is used when the argument type is a supertype of the map value type
println("map.containsValue(1 as Number) is ${map.containsValue(1 as Number)}") // true
println("map.containsValue(2 as Any) is ${map.containsValue(2 as Any)}") // true
​
println("map.containsValue(\"string\" as Any) is ${map.containsValue("string" as Any)}") // false
​
// map.containsValue("string") // cannot call extension when the argument type and the map value type are unrelated at all 
​
Open in Playground →
Target: JVMRunning on v.2.1.20