Pair And Triple

Part of the Fundamentals section of Coddy's Kotlin journey. Lesson 71 of 93.

Sometimes you need to group just two or three related values together without creating a full list. Kotlin provides Pair and Triple for exactly this purpose.

A Pair holds exactly two values. Create one using the Pair() constructor or the to keyword:

val coordinates = Pair(10, 20)
val person = "Alice" to 25  // Same as Pair("Alice", 25)

Access the values using first and second:

val point = Pair(5, 8)
println(point.first)   // 5
println(point.second)  // 8

A Triple works similarly but holds three values, accessed with first, second, and third:

val rgb = Triple(255, 128, 0)
println(rgb.first)   // 255
println(rgb.second)  // 128
println(rgb.third)   // 0

These are useful when a function needs to return multiple values, or when you want to group related data without defining a custom class. The values can be of different types, making them flexible for various situations.

Challenge

Medium

Write a function getMinMax that takes a list of integers and returns a Pair containing the minimum and maximum values, then formats them as a string.

Create a Pair where first holds the minimum value and second holds the maximum value from the list. Then return a formatted string using the pair's properties.

Parameters:

numbers (List<Int>): A list of integers with at least one element

Returns: A string in the format "Min: X, Max: Y" where X is the minimum value (first) and Y is the maximum value (second) from the Pair.

Input constraints: The input list is nonempty.

Try it yourself

fun getMinMax(numbers: List<Int>): String {
    // Write code here
}

Test yourself

This lesson includes a short quiz. Start the lesson to answer it and track your progress.

All lessons in Fundamentals

Practice on your own: Kotlin playground