{"id":5703,"date":"2020-10-08T05:08:09","date_gmt":"2020-10-08T05:08:09","guid":{"rendered":"https:\/\/prwatech.in\/blog\/?p=5703"},"modified":"2024-04-12T06:22:00","modified_gmt":"2024-04-12T06:22:00","slug":"map-in-scala-programming-language-guide-to-scala-collections","status":"publish","type":"post","link":"https:\/\/prwatech.in\/blog\/scala\/scala-modules-scala\/map-in-scala-programming-language-guide-to-scala-collections\/","title":{"rendered":"Scala – Map"},"content":{"rendered":"\r\n

A Guide to Scala Maps<\/span><\/h2>\r\n

Map:<\/h3>\r\n\r\n\r\n\r\n

Scala map is a collection of key\/value pairs. Any value can be retrieved based on its key. Keys are unique in the Map, but values need not be unique. Maps are also called Hash tables. There are two kinds of Maps, the\u00a0immutable\u00a0and the\u00a0mutable.<\/p>\r\n

Scala maps support various operations such as adding new key-value pairs, updating values for existing keys, checking for the presence of keys, iterating over key-value pairs, and applying functional transformations using higher-order functions like map<\/code>, filter<\/code>, and fold<\/code>.<\/p>\r\n

Scala also provides mutable map implementations (scala.collection.mutable.Map<\/code>) for scenarios where mutable key-value pairs are required. Understanding how to use maps effectively in Scala is essential for managing and manipulating associative data structures in functional and imperative programming paradigms. Maps offer a versatile and powerful way to organize and access data efficiently based on unique identifiers.<\/p>\r\n\r\n\r\n\r\n

It is a universal concept, where it deals with Key-Value pair.<\/p>\r\n\r\n\r\n\r\n

The fastest searching algorithm.<\/p>\r\n\r\n\r\n\r\n

use case 1:<\/strong><\/p>\r\n\r\n\r\n\r\n

package Collection\r\nclass Map1 {\r\n\r\n\u00a0 val <\/pre>\r\n
m <\/em><\/p>\r\n
= <\/pre>\r\n
Map<\/em><\/p>\r\n
(1 -> \"Python\", 2 -> \"Scala\", 3 -> \"Hadoop\")\r\n\u00a0 val <\/pre>\r\n
m1 <\/em><\/p>\r\n
= <\/pre>\r\n
Map<\/em><\/p>\r\n
((91,\"Ind\"), (7,\"USA\"), (37,\"USSR\"))\r\n\u00a0 def courses(): Unit = {\r\n\u00a0\u00a0\u00a0 <\/pre>\r\n
println<\/em><\/p>\r\n
(<\/pre>\r\n
m<\/em><\/p>\r\n
.get(2))\r\n\u00a0\u00a0\u00a0 <\/pre>\r\n
println<\/em><\/p>\r\n
(<\/pre>\r\n
m<\/em><\/p>\r\n
.keys)\r\n \u00a0\u00a0 <\/pre>\r\n
println<\/em><\/p>\r\n
(<\/pre>\r\n
m<\/em><\/p>\r\n
.values)\r\n\u00a0 }\r\n}\r\nobject ME{\r\n\u00a0 def main(args:Array[String]):Unit = {\r\n\u00a0\u00a0\u00a0 new Map1().courses()\r\n\u00a0\u00a0\u00a0 <\/pre>\r\n
println<\/em><\/p>\r\n
(\"Maps is implemented\")\r\n\u00a0 }\r\n}<\/pre>\r\n\r\n\r\n\r\n
\"\"<\/figure>\r\n\r\n\r\n\r\n
use case 2:<\/strong><\/p>\r\n\r\n\r\n\r\n
scala> val mapping = Map(“Prwa” -> “Tech”,”Hadoop” -> “Developer”,”Spark” -> “Scala”)<\/p>\r\n\r\n\r\n\r\n
scala> val mapping = scala.collection.mutable.Map(“Mysql” -> “S”,”Linux” -> “L”,”Python” -> “P”)<\/p>\r\n\r\n\r\n\r\n
1scala> val x = mapping(“Mysql”)<\/p>\r\n\r\n\r\n\r\n
2scala> val x = mapping(“Linux”)<\/p>\r\n\r\n\r\n\r\n
scala> val x = mapping(“Python”)<\/p>\r\n\r\n\r\n\r\n
scala> for((s,l) <- mapping) yield(l,s)<\/p>\r\n\r\n\r\n\r\n
\"\"<\/figure>\r\n\r\n\r\n\r\n
use case 3:<\/strong><\/p>\r\n\r\n\r\n\r\n
scala> val mapping = Map(“Tom” -> “Hardy”,”Christian” -> “Bale”)<\/p>\r\n\r\n\r\n\r\n
scala>\u00a0 val mapping = scala.collection.mutable.Map(“Leonardo” -> “D”,”Brad” -> “B”)<\/p>\r\n\r\n\r\n\r\n
1scala> val x = mapping(“Tom”)<\/p>\r\n\r\n\r\n\r\n
\"\"<\/figure>\r\n\r\n\r\n\r\n
\/\/Accessing maps<\/em><\/strong><\/p>\r\n\r\n\r\n\r\n
Contd..<\/strong><\/em><\/p>\r\n\r\n\r\n\r\n
#scala> val mapping = Map(“Tom” -> “Hardy”,”Christian” -> “Bale”)<\/p>\r\n\r\n\r\n\r\n
scala>\u00a0 val mapping<\/a> = scala.collection<\/a>.mutable.Map(“Leonardo” -> “D”,”Brad” -> “B”)<\/p>\r\n\r\n\r\n\r\n
scala> val x = mapping<\/a>(“Leonardo”)<\/p>\r\n\r\n\r\n\r\n
#Iterating Maps:<\/u><\/em><\/strong><\/p>\r\n\r\n\r\n\r\n
scala> for((d,b) <- mapping) yield(b,d)<\/p>\r\n\r\n\r\n\r\n
\"\"<\/figure>\r\n
A Guide to Scala Maps<\/p>\r\n","protected":false},"excerpt":{"rendered":"
A Guide to Scala Maps Map: Scala map is a collection of key\/value pairs. Any value can be retrieved based on its key. Keys are unique in the Map, but values need not be unique. Maps are also called Hash tables. There are two kinds of Maps, the\u00a0immutable\u00a0and the\u00a0mutable. Scala maps support various operations such […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[565,1698],"tags":[1014,1012,1008,1016,1011,1010,1015,1013,1009],"class_list":["post-5703","post","type-post","status-publish","format-standard","hentry","category-scala","category-scala-modules-scala","tag-iterating-maps","tag-map-example-program-scala","tag-map-in-scala","tag-map-scala","tag-map-scala-example","tag-mapping-scala","tag-scala-map-program","tag-scala-mapping","tag-scala-maps"],"acf":[],"yoast_head":"\nA Guide to Scala Maps - Prwatech<\/title>\n<meta name=\"description\" content=\"Master Guide to Scala Maps - Dive deep with our expert instructors and comprehensive curriculum, Enroll now.\" \/>\n<meta name=\"robots\" content=\"noindex, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"A Guide to Scala Maps - 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