Question

How to write custom callback function to an array (apply a function to each element) in Scala

Answer 1

// Your own callback function

object CallbackExample extends App {

    def applyToArray(arr: Array[Int], callback: Int => Int): Array[Int] = {
      val result = new Array[Int](arr.length)
      for (i <- arr.indices) {
        result(i) = callback(arr(i))   // apply the callback
      }
      result
    }
    
    // callback function
    def square(x: Int): Int = x * x
    
    val numbers = Array(2, 4, 6, 12)
    
    val squared = applyToArray(numbers, square)
    
    println(squared.mkString(", "))
}



/*
run:

4, 16, 36, 144

*/

 

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