Learn Scala (3)--array-related operations

Val A = Array (2, 4, 5, 6)

Val result = for (Elem <-a) yield 2 * elem//result = (4,8, 10, 12)

Val result1 = for (Elem <-a If elem% 2 = = 0) Yield 2 * elem//RESULT1 = (4,8,12)

Val result2 = A.filter (_% 2 = = 0). Map (2 * _)//result = (4,8,12)

Val Result3 = A.filter (_% 2 = = 0) Map {2 * _}//result = (4, 8, 12)

Example: Delete a negative number in an array other than the first negative number

  def Removeneg (a:array[int]) = {    true    forif First | | A (i) > 0 ) yield {      iffalse; I    }    for (J <-0 until Indexes.length) A (j) = A (indexes (j))    = a.tobuffer    - indexes.length)    B.toarray  }

Sum

Array/arraybuffer (...). Sum

Maximum Minimum

Array/arraybuffer (...). Max/min

Sort

Do not modify the original version

Val B = Array/arraybuffer (...)

Val bsorted = b.sorted

Val bdescending = B.sortedwith (_>_)

Sort on the original array (cannot be set buffer operation)

Val A = Array ()

Scala.util.Sorting.quichSort (a)

Display the contents of an array or array buffer

A.mkstring ("and")//"1 and 2 and 3"

A.mkstring ("<", ",", ">")//"<1,2,3>"

Learn Scala (3)--array-related operations