如何用负步骤迭代范围？

Question

有没有办法做这样的事情:

0 to -10 map { i=>
...
}

repl给了我:

scala.collection.immutable.IndexedSeq[Unit] = Vector()

Answer 1

0 to (-10, -1)

要么

0 to -10 by -1

Answer 2

添加by条款:

0 to -10 by -1
res0: Range(0, -1, -2, -3, -4, -5, -6, -7, -8, -9, -10)