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What is copy in Scala?

Samia Ishaque

The copy method in Scala is used to copy an instance of an object or case class. The copy obtained, however, is different from the original, as you can tweak fields to match the copy required. This is also known as making a shallow copy since the values aren’t copied from the object, but the references to object fields are.

Parameters

The copy method requires fields of the case class to be defined for the new copy you want to generate.

Return value

The copy method returns a copy of an instance of an object without cloning it completely.

Example

Below is an example of how you can use the copy method. Firstly, we create a case class Employee that stores the name, age, and salary of the employees. Then, we create an instance of the first employee who’s named Samia. We want to copy Samia’s data for another employee who is the same age and earns the same salary, but has a different name. Hence, we use the copy method to copy employee1 with a change in the name field.

case class Employee(name: String, age: Int, salary: Int)
val employee1 = Employee("Samia Ishaque", 23, 4500)
val employee2 = employee1.copy(name="Ali")
print(employee1.name +"\n")
print(employee2.name)

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