Scala -- 反转打印10 -1

现有序列 1~10 要求逆序输出10,9,8,7,6,5,4,3,2,1

方案1:

val nums = 1 to 10
for (a <- nums reverse) {
  println(a)
}

方案2

for (a <- 10 to 1 by -1) {
  println(a)
}

方案3

for (a <- 1 to 10 ){
  println(10 - a + 1 )
}