DT Big Data Dream Factory 5th Talk

DT Big Data Dream Factory 5th lecture http://yun.baidu.com/s/1jGjFpWy This section Wang teacher spoke the array. The main thing is to use the Scala worksheet feature. This function can print out the operation of each line of code. Package Com.dt.scala.hello

Import Scala.collection.mutable.ArrayBuffer

Object Arrayops {

  def main (args:array[string]): Unit = {    val nums = new Array[int] (Ten)     val a = New Array[string] (Ten)     val s = Array ("Hello", "World")     s (0) = "Goodbye"            val b = Arraybuffer[int] ()     B + = 1     B + = (1, 2, 3, 5)     b ++= Array (8,, 2)     b.trimend (5)     B.insert (6,) &NBSP;&N bsp;  B.insert (2, 7, 8, 9)     B.remove (2)     B.remove (2, 3)     B.toa Rray         for (i <-0 until a.length)      println (i + ":" + A (i) )               val c = Array (2, 3, 5, 7, one)     Val Res Ult = for (elem <-c) Yield 2 * elem     for (elem <-c if elem% 2 = = 0) Yield 2 * elem      C.filter (_% 2 = =0). Map (2 * _)         Array (1, 7, 2, 9). Sum     ArrayBuffer ("Mary", "had", "a "," little "," Lamb "). Max         val d = ArrayBuffer (1, 7, 2, 9)     Val bsor Ted = d.sorted         val e = Array (1, 7, 2, 9)     Scala.util.Sorting.quick Sort (e)         e.mkstring ("and")     a.mkstring ("<", ",", ">") & nbsp;       val matrix = array.ofdim[double] (3, 4)     Matrix (2) (1) = &NBSP;&N bsp;  val triangle = new Array[array[int] (Ten)      for (i <-0 until triangle.length)  & nbsp;   triangle (i) = new Array[int] (i + 1)          }

}

DT Big Data Dream Factory 5th Talk