scala 数组Array排序,转换字符串，过滤 quickSort,mkString,yield,filter,map

scala> scala.util.Sorting.quickSort(arr2)

scala> arr2
res42: Array[Int] = Array(1, 1, 3, 4, 10, 11, 100)

scala> arr2.mkString
res43: String = 11341011100

scala> arr2.mkString(",")
res44: String = 1,1,3,4,10,11,100

scala> val arr3=for(i<-arr2) yield i*i
arr3: Array[Int] = Array(1, 1, 9, 16, 100, 121, 10000)

scala> val arr3=for(i<-arr2 if i%3==0) yield i*i
arr3: Array[Int] = Array(9)

scala> arr2
res45: Array[Int] = Array(1, 1, 3, 4, 10, 11, 100)

scala> arr2.filter(_%3==0).map(i=>i*i)
res46: Array[Int] = Array(9)

scala> arr2.filter(_%3==0)map(i=>i*i)
res47: Array[Int] = Array(9)

scala> arr2.filter(_%3==0).map(i=>i*i)
res48: Array[Int] = Array(9)