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How to get all the keys from a Scala map
  • Last Updated : 29 Jul, 2019

In order to get all the keys from a Scala map, we need to use either keySet method (to get all the keys as a set) or we can use keys method and if you want to get the keys as an iterator, you need to use keysIterator method. Now, lets check some examples.
Example #1:




// Scala program of keySet()
// method
  
// Creating object
object GfG
  
    // Main method
    def main(args:Array[String])
    {
      
        // Creating a map
        val m1 = Map(3 -> "geeks", 4 -> "for", 2 -> "cs")
          
        // Applying keySet method
        val result = m1.keySet
          
        // Displays output
        println(result)
      
    }
}
Output:
Set(3, 4, 2)

Here, keySet method is utilized.
Example #2:




// Scala program of keys()
// method
  
// Creating object
object GfG
  
    // Main method
    def main(args:Array[String])
    {
      
        // Creating a map
        val m1 = Map(3 -> "geeks", 4 -> "for", 2 -> "cs")
          
        // Applying keys method
        val result = m1.keys
          
        // Displays output
        println(result)
      
    }
}
Output:
Set(3, 4, 2)

Here, keys method is utilized.
Example #3:




// Scala program of keysIterator()
// method
  
// Creating object
object GfG
  
    // Main method
    def main(args:Array[String])
    {
      
        // Creating a map
        val m1 = Map(3 -> "geeks", 4 -> "for", 2 -> "cs")
          
        // Applying keysIterator method
        val result = m1.keysIterator
          
        // Displays output
        println(result)
      
    }
}
Output:
non-empty iterator

Here, keysIterator method is utilized.




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