``` if (!existCell.isEmpty()) { cell = when(exis...

# codereview

[Shawn]

if (!existCell.isEmpty()) {
  cell = when(existCell[existCell.size - 1]) {
    1 -> 9
    3 -> 7
    7 -> 3
    9 -> 1
    else -> 0  // or some default value
  }
}

[ebonet]

if (!existCell.isEmpty()) {
val cellValue = existCell[existCell.size - 1]
if ( cellValue%2==0 || cellValue==5)
cell = 0
else
cell 10- cellValue
}