Min, Max and Sum in Kotlin

val prices = mutableListOf(4, 9, 2, 7)

println(prices.min())    // 2
println(prices.max())    // 9
println(prices.sum())    // 22

Full lesson:

In Maximum Number In Array, a loop found the largest value. In Sum of Numbers, a loop added numbers up. These jobs come up all the time. Kotlin lists have them built in.

• list.min() gives the smallest value of the list.
• list.max() gives the largest value.
• list.sum() adds all the values up.

maxOf(a, b) from Maximum Number In Array compares two values. max() looks at a whole list.

Watch out for an empty list. min() and max() throw a NoSuchElementException on it. An empty list has no smallest value. minOrNull() and maxOrNull() give null instead. The Elvis operator from Null Safety adds a fallback. So list.minOrNull() ?: 0 gives 0 for an empty list. sum() of an empty list is 0.

Your task

minutes holds how many minutes you practiced coding on each day of a week.

Store the shortest day in shortest and the longest day in longest. Store the week's total in total.

Use the built-ins from this lesson. The code at the bottom prints all three.

Expected output:

shortest = 15
longest = 60
total = 235