{"id":8364,"date":"2021-04-23T20:54:05","date_gmt":"2021-04-23T20:54:05","guid":{"rendered":"https:\/\/prwatech.in\/blog\/?p=8364"},"modified":"2024-04-13T06:12:25","modified_gmt":"2024-04-13T06:12:25","slug":"scala-apply-method","status":"publish","type":"post","link":"https:\/\/prwatech.in\/blog\/scala\/scala-modules-scala\/scala-apply-method\/","title":{"rendered":"Scala – Apply Method"},"content":{"rendered":"\r\n

What is the apply function in Scala<\/span><\/h2>\r\n

In Scala, the apply<\/code> function is a special method defined in companion objects of classes or in standalone objects. The primary purpose of the apply<\/code> function is to provide a convenient way to create new instances of a class or invoke an object as if it were a function.<\/p>\r\n

When you define an apply<\/code> method in a companion object, you can use it to construct instances of the corresponding class without explicitly calling the new<\/code> keyword. This allows for a more concise and readable syntax when creating instances. For example:<\/p>\r\n

In this example, the apply<\/code> method in the Person<\/code> companion object enables us to create a new Person<\/code> instance simply by calling Person(\"Alice\", 30)<\/code>, which internally delegates to Person.apply(\"Alice\", 30)<\/code>.<\/p>\r\n

In Scala the\u00a0apply()<\/strong>\u00a0method is used<\/a> to select an element<\/a> present in the list by its index position.<\/p>\r\n\r\n\r\n\r\n

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

scala> object prwa{<\/p>\r\n\r\n\r\n\r\n

\u00a0\u00a0\u00a0\u00a0 def apply(name: String): String={<\/p>\r\n\r\n\r\n\r\n

\u00a0\u00a0\u00a0\u00a0 “Hello %s”.format(name)<\/p>\r\n\r\n\r\n\r\n

\u00a0\u00a0\u00a0\u00a0 }<\/p>\r\n\r\n\r\n\r\n

\u00a0\u00a0\u00a0\u00a0 }<\/p>\r\n\r\n\r\n\r\n

object prwa<\/p>\r\n\r\n\r\n\r\n

scala> prwa.apply(“prava”)<\/p>\r\n\r\n\r\n\r\n

1scala> prwa(“binoj”)<\/p>\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> class Prwatech\u00a0 {<\/p>\r\n\r\n\r\n\r\n

\u00a0\u00a0\u00a0\u00a0 private val elements = Array(“spark”,”scala”,”mysql”)<\/p>\r\n\r\n\r\n\r\n

\u00a0 def apply(index:Int) = if(index<elements.length) elements(index) else “No element found”<\/p>\r\n\r\n\r\n\r\n

\u00a0 }<\/p>\r\n\r\n\r\n\r\n

class Prwatech<\/p>\r\n\r\n\r\n\r\n

scala> val Prwatech = new Prwatech<\/p>\r\n\r\n\r\n\r\n

2scala> println(Prwatech(1))<\/p>\r\n\r\n\r\n\r\n

scala> println(Prwatech(0))<\/p>\r\n\r\n\r\n\r\n

4scala> println(Prwatech(2))<\/p>\r\n\r\n\r\n\r\n

scala> println(Prwatech(3))<\/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> object prwatech{<\/p>\r\n\r\n\r\n\r\n

\u00a0\u00a0\u00a0\u00a0 def apply(name: String): String={<\/p>\r\n\r\n\r\n\r\n

\u00a0\u00a0\u00a0\u00a0 “My Name is %s”.format(name)<\/p>\r\n\r\n\r\n\r\n

\u00a0\u00a0\u00a0\u00a0 }<\/p>\r\n\r\n\r\n\r\n

\u00a0\u00a0\u00a0\u00a0 }<\/p>\r\n\r\n\r\n\r\n

object prwatech<\/p>\r\n\r\n\r\n\r\n

scala> prwatech.apply(“Mark”)<\/p>\r\n\r\n\r\n\r\n

scala> prwatech.apply(“Steve”)<\/p>\r\n\r\n\r\n\r\n

\"\"<\/figure>\r\n

 <\/p>\r\n

What is the apply function in Scala<\/p>\r\n","protected":false},"excerpt":{"rendered":"

What is the apply function in Scala In Scala, the apply function is a special method defined in companion objects of classes or in standalone objects. The primary purpose of the apply function is to provide a convenient way to create new instances of a class or invoke an object as if it were a […]<\/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":[1081,1087,1079,1086,1082,1085,1078,1080,1083,1084],"class_list":["post-8364","post","type-post","status-publish","format-standard","hentry","category-scala","category-scala-modules-scala","tag-apply-method","tag-apply-method-concept-in-scala","tag-apply-method-in-scala","tag-apply-method-scala-use-cases","tag-apply-method-use-cases","tag-apply-method-use-cases-in-scala","tag-apply-methods","tag-scala-apply-method","tag-scala-apply-method-example","tag-scala-apply-method-example-program"],"acf":[],"yoast_head":"\nWhat is the apply function in Scala - Prwatech<\/title>\n<meta name=\"description\" content=\"Master What is the apply function in Scala - 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