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Scala Iterator exists() method with example

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  • Last Updated : 01 Jul, 2019
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The exists() method belongs to the concrete value members of the class Abstract Iterator. It is defined in the class IterableOnceOps. It tests whether the used predicate holds for at least one element of the stated collection. It will not terminate for infinite sized collection.

Method Definition : def exists(p: (A) => Boolean): Boolean

Where, p is the predicate.

Return Type : It returns true if the given predicate p is satisfied by at least one element of the stated collection, else it returns false.

Example #1:




// Scala program of exists()
// method
  
// Creating object
object GfG
  
    // Main method
    def main(args:Array[String])
    {
      
        // Creating an Iterator 
        val iter = Iterator(7, 3, 4, 11, 13)
          
        // Applying exists method
        val result = iter.exists(x => {x % 2 == 0})
          
        // Displays output
        println(result)
      
    }
}

Output:

true

Example #2:




// Scala program of exists()
// method
  
// Creating object
object GfG
  
    // Main method
    def main(args:Array[String])
    {
      
        // Creating an Iterator 
        val iter = Iterator(7, 3, 5, 11, 13)
          
        // Applying exists method
        val result = iter.exists(x => {x % 2 == 0})
          
        // Displays output
        println(result)
          
    }
}

Output:

false

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