Scala List forall() method with example

Last Updated : 29 Jul, 2019

The forall() method is utilized to check if the given predicate satisfies all the elements of the list or not.

Method Definition: def forall (p: (a) => Boolean) : Boolean

Return Type: It returns true if the stated predicate holds true for all the elements of the list else it returns false.

Example #1:

// Scala program of forall() 
// method 
  
// Creating object 
object GfG 
{  
  
    // Main method 
    def main(args:Array[String]) 
    { 
        // Creating a list 
        val m1 = List(3, 6, 12, 9, 21) 
          
        // Applying forall method 
        val result = m1.forall(y => {y % 3 == 0}) 
          
        // Displays output 
        println(result) 
      
    } 
}  

Output:

true

Example #2:

// Scala program of forall() 
// method 
  
// Creating object 
object GfG 
{  
  
    // Main method 
    def main(args:Array[String]) 
    { 
        // Creating a list 
        val m1 = List(3, 6, 2, 9, 21) 
          
        // Applying forall method 
        val result = m1.forall(y => {y % 3 == 0}) 
          
        // Displays output 
        println(result) 
      
    } 
}  