Playing with Scala Collections

FoldExamples.scala

/*
Inspired from https://commitlogs.com/2016/09/10/scala-fold-foldleft-and-foldright/
*/

/*Find sum of first 10 integers.
  For the first step: acc will be assigned 0
  Thus making the first call  (0,1) => 0+1 => 1 which will be assigned back to the acc. 
  Thus making the second call (1,2) => 1+2 => 3 , so on and so fourth. 
*/  
  (1 to 10).foldLeft(0)( (acc,currentNumber) => acc + currentNumber ) 
//or more simply using positional arguments. 
  (1 to 10).foldLeft(0)( _ + _)

/*Reversing a list.
  We can use a ListBuffer as accumulator and keep prepending the `currentChar` to it.
  */
  import scala.collection.mutable.ListBuffer
  (1 to 10).foldLeft(ListBuffer[Int]())(
       (acc,curr) => {
         acc.+=:(curr)
       })
 //10,9,8....