{"id":14941,"date":"2018-05-14T03:47:57","date_gmt":"2018-05-14T03:47:57","guid":{"rendered":"https:\/\/data-flair.training\/blogs\/?p=14941"},"modified":"2021-12-04T10:15:44","modified_gmt":"2021-12-04T04:45:44","slug":"scala-case-class","status":"publish","type":"post","link":"https:\/\/data-flair.training\/blogs\/scala-case-class\/","title":{"rendered":"Scala Case Class – How to Create Scala Object"},"content":{"rendered":"

In this Scala tutorial<\/strong><\/a>, we will see how to define a Scala case class. Moreover, we will also take a look at how to compare case classes and create shallow copies. Along with this, we will also learn how to create a Scala object.<\/span><\/p>\n

So, let\u2019s explore Scala Case Class and Scala Object.<\/p>\n

Read\u00a0Scala Syntax: An Introductory Scala Tutorial<\/a><\/strong><\/p>\n

What is Scala Case Class?<\/h3>\n

A Scala Case Class is like a regular class, except it is good for modeling immutable data. It also serves useful in pattern matching, such a class has a default apply() method which handles object construction. A scala case class also has all <\/span>val<\/span><\/i>s, which means they are immutable.<\/span>
\nLet’s Revise Scala Syntax with example.<\/a><\/strong><\/p>\n

Defining a Minimal Case Class in Scala<\/h3>\n

To define a minimal Scala Case Class, we need the keywords \u2018case class\u2019, an identifier, and a parameter list. We can keep the parameter list empty.<\/span>
\nSo, let\u2019s define a class \u2018Song\u2019.<\/span><\/p>\n

scala> case class Song(title:String,artist:String,track:Int)<\/pre>\n
Creating a Scala Object<\/h3>\n
And now, it\u2019s time to create a Scala Object for this Scala class.<\/span><\/p>\n
scala> val stay=Song(\"Stay\",\"Inna\",4)\r\nstay: Song = Song(Stay,Inna,4)<\/pre>\n
To create a Scala Object of a case class, we don\u2019t use the keyword \u2018new\u2019. This is because its default apply() method handles the creation of objects.<\/span>
\nLet\u2019s try accessing the title of this object:<\/span><\/p>\n
scala> stay.title\r\nres1: String = Stay\r\nAnd now, let\u2019s try modifying it.\r\nscala> stay.title=\"Me Gusta\"\r\n<console>:12: error: reassignment to val\r\n      stay.title=\"Me Gusta\"\r\n                ^<\/pre>\n
Failed.<\/span>
\nExplore\u00a0Scala Closures with Examples | See What is Behind the Magic<\/a><\/strong>
\nSo, this tells us that Scala case classes hold all <\/span>val<\/span><\/i>s, and this makes them immutable. We cannot reassign them. And while it is discouraged to do so, we can use <\/span>var<\/span><\/i>s in a case class.<\/span><\/p>\n
Comparing two Case Classes<\/h3>\n
Now, let\u2019s take a look at how to compare two Scala case classes.\u00a0<\/span><\/p>\n
scala> val crybaby=Song(\"Cry Baby\",\"Melanie Martinez\",7)\r\ncrybaby: Song = Song(Cry Baby,Melanie Martinez,7)\r\nscala> val cry_baby=Song(\"Cry Baby\",\"Melanie Martinez\",7)\r\ncry_baby: Song = Song(Cry Baby,Melanie Martinez,7)\r\nThey hold the same contents, but are they the same? Let\u2019s ask Scala.\r\nscala> crybaby==cry_baby\r\nres2: Boolean = true\r\nYes. Yes, they are.<\/pre>\n
Shallow-Copying a Scala Case Class<\/h3>\n
Since a Scala case class is immutable, we might sometimes need a copy to make changes in without changing the original. So, we now see how to create a shallow copy of it. But before that, let\u2019s see a little about shallow and deep copies.<\/span><\/p>\n
A deep copy<\/strong> is a copy to another object where any changes we make to it don\u2019t reflect in the original object.<\/p>\n
\"Scala<\/a>
Scala Case class- Deep copy<\/p><\/div>\n
A shallow copy<\/strong>, however, is one where changes to the copy do reflect in the original.<\/span><\/p>\n
\"Scala<\/a>
Scala Case class- Shallow copy<\/p><\/div>\n
So, Scala uses the method copy() to carry out a shallow copy.<\/span><\/p>\n
scala> val chandelier1=chandelier.copy()\r\nchandelier1: Song = Song(Chandelier,Sia Furler,3)<\/pre>\n
It is also possible to change the constructor arguments.<\/span><\/p>\n
scala> val chandelier2=chandelier.copy(title=chandelier.artist,artist=\"Sia\")\r\nchandelier2: Song = Song(Sia Furler,Sia,3)<\/pre>\n
So, this was all about Scala Case Class and Scala Object. Hope you like our explanation.<\/p>\n
Conclusion: Scala Case Class and Scala object<\/h3>\n
So, this is how we define a case class and process it. Hence, we saw Scala Case Class. Moreover, we discussed Creating a Scala object. Also, we compared two Scala Case Classes. Finally, we looked at shallow copying a Scala Case Class. Furthermore, feel free to leave your doubts and suggestions in the comment section.<\/span>
\nFor reference<\/a><\/strong>
In this Scala tutorial, we will see how to define a Scala case class. Moreover, we will also take a look at how to compare case classes and create shallow copies. 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