Scala Map keys() method with example

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.