scala

CollectionOperators.scala

Immutable
val numList = List[Int](1, 2, 3)
val numList2 = List[Int](10, 20, 30)
val numList3 = 1 :: 2:: 3:: Nil 		 //List(1, 2, 3)
val numlist3 = numList ++ numList2   	 //List(1, 2, 3, 10, 20, 30)
val x = 100 :: numList               		 //List(100, 1, 2, 3)
val x1 = numList :+ 100             		 //List(1, 2, 3, 100)
val x2 = 100 +: numList             		 //List(100, 1, 2, 3)
val x3 = numList :: numList2         	 //List(List(1, 2, 3), 10, 20, 30)
val y = numList +: numList2          	 //List(List(1, 2, 3), 10, 20, 30)
val x = numList +: numList2 :+ 1000 	 //List(List(1, 2, 3), 10, 20, 30, 1000)
val ap = 42 +: numList :+ 89        	 //List(42, 1, 2, 3, 89)

Mutable
val b1 = Buffer(1,2,3)
val b2= Buffer(100,200,300)
val b3 = b1 ++= b2                		//Vector(1, 2, 3, 100, 200, 300)
val b4 = b1 ++= numList2          		//ArrayBuffer(1, 2, 3, 100, 200, 300, 10, 20, 30)
val b4 = b1 --= numList2          		//ArrayBuffer(1, 2, 3, 100, 200, 300)
val b4 = b1 -= 100               		//ArrayBuffer(1, 2, 3, 200, 300)
val b4 = b1 += 100                		//ArrayBuffer(1, 2, 3, 200, 300, 100)