{"id":5659,"date":"2020-10-05T11:50:04","date_gmt":"2020-10-05T11:50:04","guid":{"rendered":"https:\/\/prwatech.in\/blog\/?p=5659"},"modified":"2024-04-11T07:19:44","modified_gmt":"2024-04-11T07:19:44","slug":"collections-in-scala-programming-language","status":"publish","type":"post","link":"https:\/\/prwatech.in\/blog\/scala\/scala-modules-scala\/collections-in-scala-programming-language\/","title":{"rendered":"Scala – Collections"},"content":{"rendered":"\r\n

Guide to to Scala Collections<\/span><\/h2>\r\n

 <\/p>\r\n

Scala <\/a><\/strong>consists of rich set of collection library. Collections<\/strong> consist of list of items. Those items can be sequenced in a way like Array<\/strong>, List<\/strong>, Tuple<\/strong>, Option<\/strong>, Map<\/strong>, iterator<\/strong>, sets<\/strong> etc.<\/p>\r\n

 <\/p>\r\n

Scala collections provide a rich set of data structures and operations for managing and manipulating data efficiently. Understanding Scala collections is fundamental for developing scalable and functional applications in Scala. Scala collections can be broadly categorized into mutable and immutable collections, each serving specific use cases based on mutability requirements.<\/p>\r\n

Immutable collections in Scala, such as List, Set, Map, and others, are thread-safe and cannot be modified after creation. Operations on immutable collections return new collections without altering the original, promoting functional programming principles and ensuring predictable behavior.<\/p>\r\n

Mutable collections provide mutability and direct modification capabilities, suitable for performance-critical scenarios where in-place modifications are necessary.<\/p>\r\n

Guide to to Scala Collections<\/p>\r\n\r\n\r\n\r\n

1) Array<\/strong><\/h3>\r\n\r\n\r\n\r\n

a)<\/strong><\/p>\r\n\r\n\r\n\r\n

\u00a0<\/pre>\r\n
val n = new Array[Int](5) scala> val st = new Array[String](5) scala> val st = Array(\"Big\",\"Data\",\"s\",\"s\",\"t\",\"u\",\"u\",\"w\",\"w\") valst1=Array(\"Hello\",\"Prwatech\",\"p\",\"s\",\"t\",\"u\",\"v\",\"w\",\"x\",\"y\",\"z\",\"z\",\"b\",\"c\",\"d\",\"e\")<\/pre>\r\n
\u00a0<\/pre>\r\n
 <\/p>\r\n\r\n\r\n\r\n\r\n\r\n
b)<\/strong><\/p>\r\n\r\n\r\n\r\n
\u00a0<\/pre>\r\n\r\n\r\n\r\n\r\n\r\n
2) List<\/strong><\/p>\r\n\r\n\r\n\r\n
a)<\/strong><\/p>\r\n\r\n\r\n\r\n
scala> val lst = List(5,6)<\/code><\/pre>\r\n\r\n\r\n\r\n\r\n\r\n
scala> lst.head<\/code><\/pre>\r\n\r\n\r\n\r\n\r\n\r\n
scala> lst.tail<\/code><\/pre>\r\n\r\n\r\n\r\n\r\n\r\n
#Adding new elements using \u201c::\u201d from given head and tail<\/u><\/em><\/strong><\/p>\r\n\r\n\r\n\r\n
scala> 4 : : lst<\/code><\/pre>\r\n\r\n\r\n\r\n\r\n\r\n
b) <\/strong><\/p>\r\n\r\n\r\n\r\n
scala> var lst = List(5,6,\u201dd\u201d,\u201de\u201d,\u201d1\u2033)\r\n\r\nscala> lst.head\r\n\r\nscala> lst.tail\r\n\r\nscala> \u201ce\u201d::List(\u201c5\u2033,\u201d1\u201d)\r\n\r\nscala> \u201c4\u201d::lst<\/code><\/pre>\r\n\r\n\r\n\r\n\r\n\r\n
3) Tuples<\/strong><\/p>\r\n\r\n\r\n\r\n
a)<\/strong><\/p>\r\n\r\n\r\n\r\n
scala> val a = (1,3,\u201dPrwatech\u201d,1.5)\r\n\r\nscala> a._2\r\n\r\nscala> a._3\r\n\r\nscala> a._4<\/code><\/pre>\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n
b)<\/strong><\/p>\r\n\r\n\r\n\r\n
scala> val x = (\u201cab\u201d,3,\u201dPrwa\u201d,1.5,\u201di\u201d)\r\n\r\nscala> x._1\r\n\r\nscala> x._4\r\n\r\nscala> x._5<\/code><\/pre>\r\n\r\n\r\n\r\n\r\n\r\n
4) Map<\/strong><\/p>\r\n\r\n\r\n\r\n
a)<\/strong><\/p>\r\n\r\n\r\n\r\n
scala> val mapping = Map(\u201cTom\u201d -> \u201cHardy\u201d,\u201dChristian\u201d -> \u201cBale\u201d)\r\n\r\nscala>  val mapping = scala.collection.mutable.Map(\u201cLeonardo\u201d -> \u201cD\u201d,\u201dBrad\u201d -> \u201cB\u201d)\r\n\r\nscala> val x = mapping(\u201cTom\u201d)<\/code><\/pre>\r\n\r\n\r\n\r\n\r\n\r\n
Accessing Map<\/em><\/strong><\/p>\r\n\r\n\r\n\r\n
scala> val mapping = Map(\u201cTom\u201d -> \u201cHardy\u201d,\u201dChristian\u201d -> \u201cBale\u201d)\r\n\r\nscala>  val mapping = scala.collection.mutable.Map(\u201cLeonardo\u201d -> \u201cD\u201d,\u201dBrad\u201d -> \u201cB\u201d)\r\n\r\nscala> val x = mapping(\u201cLeonardo\u201d)<\/code><\/pre>\r\n\r\n\r\n\r\n
 Iterating Map elements<\/strong><\/em><\/p>\r\n\r\n\r\n\r\n
scala> for((d,b) <- mapping) yield(b,d)<\/code><\/pre>\r\n\r\n\r\n\r\n\r\n\r\n
b)<\/strong><\/p>\r\n\r\n\r\n\r\n
Scala> val mapping = Map(\u201cPrwa\u201d -> \u201cutkarsh\u201d,\u201dVinay\u201d -> \u201cVerma\u201d)\r\n\r\nScala> val mapping = scala.collection.mutable.Map(\u201cVishal\u201d -> \u201cK\u201d,\u201dVijay\u201d -> \u201cv\u201d)\r\n\r\nScala> val x = mapping(\u201cPrwa\u201d)<\/code><\/pre>\r\n\r\n\r\n\r\n\r\n\r\n
Accessing Map elements <\/em><\/strong><\/p>\r\n\r\n\r\n\r\n
Scala> val mapping = Map(\u201cPrwa\u201d -> \u201cutkarsh\u201d,\u201dVinay\u201d -> \u201cVerma\u201d)\r\n\r\nScala>  val mapping = scala.collection.mutable.Map(\u201cVishal\u201d -> \u201cK\u201d,\u201dVijay\u201d -> \u201cv\u201d)\r\n\r\nScala> val x = mapping(\u201cVishal\u201d)<\/code><\/pre>\r\n\r\n\r\n\r\n
Iterating Map elements<\/em><\/strong><\/p>\r\n\r\n\r\n\r\n
 Scala> for((k,v) <- mapping) yield(v,k)<\/code><\/pre>\r\n\r\n\r\n\r\n\r\n\r\n
5) ArrayBuffer<\/strong><\/p>\r\n\r\n\r\n\r\n
a)<\/strong><\/p>\r\n\r\n\r\n\r\n
scala> import scala.collection.mutable.ArrayBuffer\r\n\r\nscala> val x = ArrayBuffer[Int]()\r\n\r\nscala> x+=1\r\n\r\nscala> print(x++=Array(3,4,5))\r\n\r\nscala> print(x++=Array(6))\r\n\r\nscala> print(x+=(7))<\/code><\/pre>\r\n\r\n\r\n\r\n\r\n\r\n
b)<\/strong><\/p>\r\n\r\n\r\n\r\n
scala> import scala.collection.mutable.ArrayBuffer\r\n\r\nscala> val x = ArrayBuffer[String]()\r\n\r\nscala> x+=\u201da\u201d\r\n\r\nscala> print(x++=Array(\u201cb\u201d,\u201dc\u201d,\u201dd\u201d))\r\n\r\nscala> print(x++=Array(\u201ce\u201d))\r\n\r\nscala> print(x+=(\u201cf\u201d))<\/code><\/pre>\r\n\r\n\r\n\r\n\r\n\r\n
6) Set <\/strong><\/p>\r\n\r\n\r\n\r\n
A Scala Set is a type of collection<\/a> that doesn’t accept duplicates<\/p>\r\n\r\n\r\n\r\n
a)<\/strong><\/p>\r\n\r\n\r\n\r\n
scala> var s=Set(1,2,3,3,2,5)\r\n\r\n\r\nscala> var s:Set[Int]=Set(1,2,3,3,5)\r\n\r\nscala> s.head\r\n\r\nscala> s.tail\r\n\r\nscala> s.isEmpty\r\nval res3: Boolean = false\r\n\r\nscala> var s1=Set(7,9,8,9)\r\n\r\n\/\/concatenating two sets s and s1\r\n\r\nscala> s++s1\r\n\r\n\r\n\/\/find max no from s and s1 set\r\n\r\nscala> s.max\r\n\r\n\r\nscala> s1.max\r\n\r\n\r\n\/\/find min no from sets s1 and s\r\n\r\nscala> s1.min\r\n\r\n\r\nscala> s.min\r\n<\/code><\/pre>\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n
b)<\/strong><\/p>\r\n\r\n\r\n\r\n
scala> val a=Set(9,9,3,3,2,\u201da\u201d,7,\u201db\u201d)\r\n\r\n\r\nscala> a.head\r\n\r\n\r\nscala> a.tail\r\n

\r\n<\/code><\/pre>\r\n\r\n\r\n","protected":false},"excerpt":{"rendered":"
Guide to to Scala Collections   Scala consists of rich set of collection library. Collections consist of list of items. Those items can be sequenced in a way like Array, List, Tuple, Option, Map, iterator, sets etc.   Scala collections provide a rich set of data structures and operations for managing and manipulating data efficiently. 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