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Scala Mutable SortedMap filterKeys() method with example
  • Last Updated : 04 May, 2020

The filterKeys() method is utilized to find all the pairs where the keys satisfies the given predicate.

Method Definition: def filterKeys(p: (A) => Boolean): SortedMap[A, B]

Return Type: It returns all the “key-value” pairs of the SortedMap where, the keys satisfies the given predicate.

Example #1:

filter_none

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// Scala program of filterKeys()
// method
import scala.collection.SortedMap
  
// Creating object
object GfG
  
    // Main method
    def main(args:Array[String])
    {
      
        // Creating SortedMap
        val m1 = SortedMap(5 -> "geeks", 4 -> "for", 2 -> "cs")
          
        // Applying filterKeys method
        val result = m1.filterKeys(_ > 2)
          
        // Displays output
        println(result)
      
    }
}

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Output:



Map(4 -> for, 5 -> geeks)

Here, only two key-value pairs are returned as their keys are greater than two as per the stated predicate.
Example #2:

filter_none

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// Scala program of filterKeys()
// method
import scala.collection.SortedMap
  
// Creating object
object GfG
  
    // Main method
    def main(args:Array[String])
    {
      
        // Creating SortedMap
        val m1 = SortedMap(3 -> "geeks", 1 -> "for", 2 -> "cs")
          
        // Applying filterKeys method
        val result = m1.filterKeys(_ > 3)
          
        // Displays output
        println(result)
      
    }
}

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Output:

Map()

Here, no pair is returned as none of the keys satisfies the stated predicate.

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