You would like to group a list of students by last name and get the total number of groups. Which line of code accomplishes this, assuming you have a list of the Student data class? Data class Student(val firstName: String, val lastName: String)

A) Println(students.groupBy{ it.lastName }.count()) B) Println(students.groupBy{ it.lastName.first() }.fold().count()) C) Delegates.rx() D) Println(students.groupingBy{ it.lastName.first() }.size())

Answer & Solution

Correct Answer: Option A

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You would like to group a list of students by last...

You would like to group a list of students by last name and get the total number of groups. Which line of code accomplishes this, assuming you have a list of the Student data class? Data class Student(val firstName: String, val lastName: String)

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