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Sets

Additional Set Functions

In addition to adding and removing elements from a set, the set collection supports a myriad of other functionalities. You can find the entire list in Kotlin’s documentation.

In this exercise, we’ll explore some of the most common set functions using the following example:

var numbers = setOf(10, 15, 20, 25)

To retrieve, the first element of any set, we can use the first() function:

numbers.first() // 10

To retrieve the last element of any set, we can use the last() function:

numbers.last() // 25

Finally, if we’d like to sum up all of the elements in a set, we can use the sum() function:

numbers.sum() // 70

Note: To see the output of each function call on a set, it must be wrapped in a print statement.

Instructions

In Midterm.kt, we’ll write a program that determines if a class has failed or passed a midterm.

First let’s gather the grades, and store them in a mutable set, testGrades, with the following numerical values:

65
50
72
80
53
84

Next, we’ll utilize the following formula to declare 3 variables that we’ll use to calculate the average:

 $average \ = \ sum \ / number \ of \ elements$

First, declare the variable, sum, and within it store the result of calling the sum() function on testGrades.
Declare the variable, numStudents, and within it store the result of using the size property on testGrades.
Finally, declare the variable, average and assign it the division expression of sum divided by numStudents.

Lastly, set up a conditional that follows this logic:

If the average grade is less than 65, then output the text, "Failed".
Otherwise, output the text, "Passed".

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