This is an excerpt from theScala Cookbook(#ad)(partially modified for the internet). This is Recipe 6.8, “How to create object instances without using the ‘new’ keyword.” Update! This text was written forScala 2. Things have changed a bit inScala 3, and this approach is generally NO...
You can create an empty mutable map initially and then add elements to it, using +=. objectmyObject{defmain(args:Array[String]):Unit={valcars=collection.mutable.Map[String,String]()println(cars)println("Adding new elements to the map")cars+=("BMW"->"Z4")println(cars)}} ...
Inner Classis a special concept in Scala using which we can create a class inside another class. It is used for grouping together classes to improve the usability of the concept of encapsulation in Scala. Though Scala inherits many features from Java but, the binding of inner classes. The inn...
This syntax looks a lot like the Java way to create an object, except (a) you don't need the "new" keyword before theList, and (b) you don't have to declare the type of elements in theList. Note that if you're going to mix types in aListconstructor, you may need to manually...
println("\nStep 2: How to create an implicit function to convert a String to the wrapper String class")objectDonutConverstions {implicitdef stringToDonutString(s: String) =newDonutString(s) } println("\nStep 3: How to import the String conversion so that it is in scope") ...
However, behind the scenes, Scala converts that line of code into this code: p.name_$eq("Ron Artest") To demonstrate this, you can run the following object that calls the mutator method in both ways (not something that’s normally done): ...
We use the java.io objects to write text to a file in Scala, as it relies on Java objects for performing various functions. Use PrintWriter to Write Text Into a File in Scala The following steps must be performed to write to a file in Scala. Create a PrintWriter object using the file...
<QuerySet[<Product: Product object (1)>]> If we want to see more objects, we only need to create more objects using the following command. Product.objects.create() Suppose our Product model has four fields. These four fields must pass in the create() method to create a new object....
Examples of Scala Function Examples of (simple function, parameterized function, etc.). Example #1 This example shows the use of functions without parameters. Code: object Main extends App{ // Your code here! // calling function simpleFunction() ...
Method Unapply of Scala Companion Object Here we saw that adding apply method lets us create new objects, in the same way, we can use UNAPPLY method to the de-construct instance. Applying the unapply method in the companion object creates an extractor method to extract the field out of objec...