Scala Experience

Scala Map Examples

Notes on maps :
– there is mutable and immutable maps
Examples :
import scala.collection.mutable.Map
val rucksack = Map[Int, String]()
rucksack += (1 -> “shawl”)
rucksack += (2 ->”gloves”)
rucksack += (3->”hat”)
println(rucksack)
val ruckSackPile = Map[Int, String](1 -> “shawl”, 2 ->”gloves”, 3->”hat”)
println(ruckSackPile)
Reference:
1. Programming in Scala: A Comprehensiv e Step-by-step Guide

Scala Sets Examples

Notes on sets :
– Scala provides mutable and immutable sets. (scala.collection.mutable, scala.collection.immutable )
Sets examples :
– Sets creating, initializating
scala> import scala.collection.mutable.Set
scala> val teniscordVisitorsSet = Set(“Players”, “Watchers”)
scala> tenisCordVisitorsSet += “Referees”
scala>import scala.collection.immutable.HashSet
scala>val tenisCordVisitorsSet = HashSet(“Players”, “Watchers”)
Reference :
1.  Programming in Scala: A Comprehensiv e Step-by-step Guide

Scala Tuples Examples

My notes on tuples :
– tuples are immutable, but unlike lists, tuples can contain different types of elements
– tuples are very useful when you need to return multiple objects
Tuples examples :
– Access to element of tuple
scala > val pair = (99, “Luftballons”)
scala > println(pair._1)
scala > println(pair._2)
Reference :
1. Programming in Scala: A Comprehensiv e Step-by-step Guide

Scala List Examples

My notes on scala.lists :
– scala.list is different from java.util.List
– scala.list is  ‘immutable sequence of objects’
– scala list doesn’t support append operation
Some Scala list operators and methods:

::: – for list concatenation
scala > val oneTwo = List(1, 2)
scala > val threeFour = List(3, 4)
scala > val oneTwoThreeFour = oneTwo ::: threeFour

:: – cons operator – prepends …

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