Q236
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())
AnswerB.
Println(students.groupBy{ it.lastName.first() }.fold().count())
C.
Delegates.rx()
D.
Println(students.groupingBy{ it.lastName.first() }.size())
Answer: Option A
Solution
Answer: Option A
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