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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Question: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)

1.Println(students.groupBy{ it.lastName }.count())

2.Println(students.groupBy{ it.lastName.first() }.fold().count())

3.Println(students.groupingBy{ it.lastName.first() }.count())

4.Println(students.groupingBy{ it.lastName.first() }.size())

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  1. 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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