Challenge: Null Safety

Great to see you here! I could really use your help!

I'm having an issue with Kotlin, specifically with a piece of code where I want to display information about my employee. The problem is that the salary data we received from the form filled out by our accountant is coming through as null. I’m not sure how to handle this yet, but I was told you could help!

Please fix the code below so that it works and displays the correct salary.

Note

Keep in mind that the salary at our company is calculated as follows: For the developer position, it’s 980 units per year of experience.

Use the null safety operations we covered in the last chapter to solve this problem!

Main


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fun main() {
    val name: String = "John"
    val position: String = "Developer"
    var salary: Int = null
    var yearsOfExperience: Int = 4
    val salaryPerYear: Int = 980

    for (i in 0 .. yearsOfExperience) {
        salary = salary + salaryPerYear * i
    }
    
    println("Employee $name has a salary of $salary")
}

When initializing the variable, use the Elvis operator to assign a salary of 0 if it's null.
Use a null check with an if statement or a non-null assertion inside the loop to fix this code.


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fun main() {
    val name: String = "John"
    val position: String = "Developer"
    var salary: Int? = null ?: 0
    var yearsOfExperience: Int = 4
    val salaryPerYear: Int = 980

    for (i in 1 .. yearsOfExperience) {
        if (salary != null) {
            salary = salary + salaryPerYear
        }
        // or you can use the following solution
        // salary = salary!! + salaryPerYear
    }

    println("Employee $name has a salary of $salary")
}

Everything was clear?

Thanks for your feedback!

Section 2. Chapter 8