Pairwise comparison array Scala

Question

I 'm trying to compare if two consecutive elements of an array are equal.

I have tried using for but as it returns a boolean but it does not seem to work what am I missing

val array1 = Array(1, 4, 2, 3)

def equalElements(array : Array[Int]) : Boolean = {
  
  for (i <- 1 to  (array.size )) {
    if (array(i) == array(i + 1)) true else false
  }
}

Somewhat off-topic, but if (booleanCheck) true else false can just be written as booleanCheck since that expression returns a Boolean anyway. — James Whiteley
– James Whiteley, Commented Oct 2, 2020 at 10:35
even If when I store the result of if expression it shows the unit error — Her sincerly
– Her sincerly, Commented Oct 2, 2020 at 14:08

Ivan Stanislavciuc · Accepted Answer · 2020-10-02 10:15:31Z

3

You can use sliding that

Groups elements in fixed size blocks by passing a "sliding window" over them (as opposed to partitioning them, as is done in grouped.)

val array1 = Array(1, 1, 2, 2)
val equalElements = array1
  .sliding(size = 2, step = 1) //step = 1 is a default value.
  .exists(window => window.length == 2 && window(0) == window(1))

answered Oct 2, 2020 at 10:15

Ivan Stanislavciuc

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