Gain insights into Kotlin’s syntax, type inference, higher-order functions, classes, operator overloading, and extension functions. Explore key features to enhance your efficiency in Kotlin development.

kotlin.tar.gz

Kotlin

Kotlin-1

Kotlin is an elegant general-purpose language with a rich syntax that enables us to write concise and expressive code. Much of its appeal also stems from the fact that it is fully interoperable with Java and has multi-platform support. Kotlin is also an official Android language ranked by Google as the most preferred language for Android app development.

In this course, you’ll learn about type inference in Kotlin as well as about Kotlin’s support for higher-order functions. You’ll cover classes, objects, and other interesting themes relevant to these topics. You’ll finish with operator overloading, extension functions, and scoping functions.

This course is specially designed for Java professionals who want to get into Kotlin development with minimal time and effort. This is not an encyclopedic work on Kotlin. Rather, it focuses on the necessary foundations and the best features that Kotlin has to offer. After completing this course, you’ll feel more comfortable reading and writing Kotlin code.

Kotlin Compact

# Problem statement
In this challenge, you have to implement a bi-directional association of the departments and employee, as shown in the figure.

## Class definitions
Your task is to implement two classes, `Department` and `Employee`. 

### The `Department` class
The `Department` class should have these properties:
- The `name` of the `String` type
- The `employees` of the `MutableList<Employee>` type
> The list of employees is for keeping track of all the employees working in that department.

### The `Employee` class
The `Employee` class should have these properties:
- The `firstName`  of the `String` type 
- The `lastName` of the `String` type 
- The `department` of the `Department` type 

In addition, you are required to define the following for the `Employee` class: 
- A setter for the `department` property that will also update the `employees` list of the new and the previous department to which the employee belonged. 


## Sample test case
```kotlin
val department1 = Department("Electrical")
val department2 = Department("Mathematics")
val employee = Employee("Alex", "Prufrock", department1)
employee.department = department2
```
## Expected output
```kotlin
department1.name => "Electrical"
department2.name => "Mathematics"

employee.department.name => "Mathematics"
department1.employees => [] 
department2.employees => [<Employee object for Alex>]
```

Test your understanding by solving the challenge given in this lesson.

About the course

Understanding Kotlin Code

Some Interesting Kotlin Features

More Kotlin Magic

Conclusion

Challenge: Setters

Problem statement