arrays - 生成新数组，其中所有正数首先出现，然后是负数或零，但顺序相同

Question

这是来自 Scala for the Impatient 的问题, Arrays 一章说明为

Given an array of integers, produce a new array that contains all positive values of the original array, in their original order, followed by all values that are zero or negative, in their original order.

我的尝试是

scala> val b = Array(-1, 2,3,4, -10, 0, -12)
b: Array[Int] = Array(-1, 2, 3, 4, -10, 0, -12)

scala> val(positive, negative) = b partition(_ > 0)
positive: Array[Int] = Array(2, 3, 4)
negative: Array[Int] = Array(-1, -10, 0, -12)

scala> positive ++ negative
res11: Array[Int] = Array(2, 3, 4, -1, -10, 0, -12)

我可以在一行中做得更好吗？我不确定

Answer 1

考虑 filter和 filterNot如下，

b.filter(_ > 0) ++ b.filterNot(_ > 0)