How to check if LinkedHashMap contains a value in Kotlin
In Kotlin, the containsValue() method is used to check if the LinkedHashMap contains a value passed as an argument.
Syntax
fun containsValue(value: V): Boolean
Parameters
This method takes value as an argument.
Return value
This method returns true if the value is mapped to one or more keys. If not, it returns false.
Example
fun main() {
//create a new LinkedHashMap which can have string type as key, and int type as value
val map: LinkedHashMap<Int, String> = linkedMapOf()
map.put(1, "one")
map.put(2, "two")
println("The map is : $map")
print("Checking if the map has value 'one' : ")
var hasValue: Boolean = map.containsValue("one")
println(hasValue)
hasValue = map.containsValue("three")
print("Checking if the map has value 'three' : ")
println(hasValue)
}Explanation
-
Line 3: We create a
LinkedHashMapobject with the namemap. We use thelinkedMapOfmethod to create an emptyLinkedHashMap. -
Lines 4 and 5: We use the
put()method to add two new entries{1=one, 2=two}to themap. -
Line 8: We use the
containsValue()method withoneas an argument. This checks if themaphas an entry with the valueone. In our case, it returnstrue. -
Line 11: We use the
containsValue()method withthreeas an argument. This checks if themaphas an entry with the valuethree. In our case, it returnsfalse.
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