A Tour of Scala - an interactive scala tutorial - Mutable Collections Operations

import scala.collection.mutable  

val arrayBuffer = mutable.ArrayBuffer(1, 2, 3)   
val listBuffer = mutable.ListBuffer("a", "b", "c")  
val hashMap = mutable.Map("one" -> 1, "two" -> 2, "three" -> 3)  

arrayBuffer += 4  
listBuffer += "d"  
arrayBuffer -= 1  
listBuffer -= "a"  
hashMap += "four" -> 4  
hashMap -= "one"  

arrayBuffer ++= List(5, 6, 7)  
hashMap ++= Map("five" -> 5, "six" -> 6)  
hashMap --= Set("one", "three")  


println(arrayBuffer)  
println(listBuffer)  
println(hashMap)

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27 Mutable Collections Operations

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