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 m 1 = Map( "geeks" - > 5 , "for" - > 3 , "cs" - > 2 )
// Applying keys method
val result = m 1 .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 m 1 = Map( "geeks" - > 5 , "for" - > 3 , "geeks" - > 5 )
// Applying keys method
val result = m 1 .keys
// Displays output
println(result)
}
} |
Output:
Set(geeks, for)
So, the identical keys are taken only once.