Assignment 4

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Question 1 1 point

Let’s assume that this code has already been executed:

val numbers = Vector(15, 7, 5, 27, 3, 8, 67, 28, 39, 15, 115, 23)
val byLastDigit = numbers.groupBy( _ % 10 )
val smallestGroupFirst = byLastDigit.toVector.sortBy( _._2.size )

We group the numbers by their last digit.

We sort the groups based on which of the last digits is more common.

Which of the following claims about the code are correct?

The second line creates a Map[Int, Vector[Int]], which contains five key–value pairs.

The toVector call on the third line could be removed, and we’d still get a collection that is similarly sorted.

The additional command smallestGroupFirst.toMap.values.toVector would give us a Vector[Vector[Int]], sorted to start with those numbers whose last digit is the rarest.

The additional command smallestGroupFirst.map( _._2 ) would give us a Vector[Vector[Int]], sorted to start with those numbers whose last digit is the rarest.

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Exercise info

Assignment category: Graded
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Deadline: Wednesday, 17 November 2021, 12:00
Late submission deadline: Friday, 15 April 2022, 12:00 (-100%)
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Total number of submitters: 602