In Scala Stack class
, the dropWhile() method is utilized to drop the longest prefix from the top which satisfies a given predicate in a stack.
Method Definition: def dropWhile(p: (A) => Boolean): Stack[A]
Return Type: It returns a new stack that consists of elements after dropping the longest prefix satisfying the given predicate.
Example #1:
// Scala program of dropWhile() // method // Import Stack import scala.collection.mutable. _
// Creating object object GfG
{ // Main method
def main(args : Array[String])
{
// Creating stack
val s 1 = Stack( 6 , 2 , 3 , 4 , 5 )
// Print the stack
println(s 1 )
// Applying dropWhile method
val result = s 1 .dropWhile(x => {x % 2 == 0 })
// Displays output
print( "Stack after using dropWhile() method: " + result)
}
} |
Output:
Stack(6, 2, 3, 4, 5) Stack after using dropWhile() method: Stack(3, 4, 5)
Example #2:
// Scala program of dropWhile() // method // Import Stack import scala.collection.mutable. _
// Creating object object GfG
{ // Main method
def main(args : Array[String])
{
// Creating stack
val s 1 = Stack( 1 , 7 , 2 , 3 , 4 , 5 )
// Print the stack
println(s 1 )
// Applying dropWhile method
val result = s 1 .dropWhile(x => {x % 2 ! = 0 })
// Displays output
print( "Stack after using dropWhile() method: " + result)
}
} |
Output:
Stack(1, 7, 2, 3, 4, 5) Stack after using dropWhile() method: Stack(2, 3, 4, 5)