1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
|
fun groupBySample() {
val words = listOf("a", "abc", "ab", "def", "abcd")
val byLength = words.groupBy { it.length }
assertPrints(byLength.keys, "[1, 3, 2, 4]")
assertPrints(byLength.values, "[[a], [abc, def], [ab], [abcd]]")
val mutableByLength: MutableMap<Int, MutableList<String>> = words.groupByTo(mutableMapOf()) { it.length }
// same content as in byLength map, but the map is mutable
assertTrue(mutableByLength == byLength)
}
/**
* @sample groupBySample
*/
fun foo() {
}
|
