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Scala Map keys() method with example

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  • Last Updated : 13 Aug, 2019
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The keys() method is utilized to give an iterator over all the keys of the map.

Method Definition: def keys: Iterable[A]

Return Type: It returns an iterator over all the keys of the map.

Example #1:




// Scala program of keys()
// method
  
// Creating object
object GfG
  
    // Main method
    def main(args:Array[String])
    {
      
        // Creating map
        val m1 = Map("geeks" -> 5, "for" -> 3, "cs" -> 2)
          
          
        // Applying keys method 
        val result = m1.keys
          
        // Displays output
        println(result)
    }
}


Output:

Set(geeks, for, cs)

Example #2:




// Scala program of keys()
// method
  
// Creating object
object GfG
  
    // Main method
    def main(args:Array[String])
    {
      
        // Creating map
        val m1 = Map("geeks" -> 5, "for" -> 3, "geeks" -> 5)
          
          
        // Applying keys method 
        val result = m1.keys
          
        // Displays output
        println(result)
    }
}


Output:

Set(geeks, for)

So, the identical keys are taken only once.


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