data class Item(val a: Int, val b: Int, val label: String)
fun sortData(items: List<Item>): List<Item> =
items.sortedWith(compareBy<Item> { it.a }.thenBy { it.b })
fun printData(items: List<Item>) =
items.forEach { println("(${it.a}, ${it.b}, ${it.label})") }
fun findByLabel(items: List<Item>, label: String): Item? =
items.find { it.label == label }
fun filterByA(items: List<Item>, value: Int): List<Item> =
items.filter { it.a == value }
fun main() {
val data = listOf(
Item(7, 2, "python"),
Item(8, 3, "c"),
Item(3, 5, "c++"),
Item(4, 1, "c#"),
Item(3, 2, "java"),
Item(7, 1, "go"),
Item(1, 2, "rust")
)
val sorted = sortData(data)
println("Sorted data:")
printData(sorted)
println("\nSearching for 'java':")
findByLabel(sorted, "java")?.let { println(it) }
println("\nFiltering items where a == 7:")
val filtered = filterByA(sorted, 7)
printData(filtered)
}
/*
run:
Sorted data:
(1, 2, rust)
(3, 2, java)
(3, 5, c++)
(4, 1, c#)
(7, 1, go)
(7, 2, python)
(8, 3, c)
Searching for 'java':
Item(a=3, b=2, label=java)
Filtering items where a == 7:
(7, 1, go)
(7, 2, python)
*/
