groupBySamplenull1 fun groupBySample() {
2 val words = listOf("a", "abc", "ab", "def", "abcd")
3 val byLength = words.groupBy { it.length }
4
5 assertPrints(byLength.keys, "[1, 3, 2, 4]")
6 assertPrints(byLength.values, "[[a], [abc, def], [ab], [abcd]]")
7
8 val mutableByLength: MutableMap<Int, MutableList<String>> = words.groupByTo(mutableMapOf()) { it.length }
9 // same content as in byLength map, but the map is mutable
10 assertTrue(mutableByLength == byLength)
11 }
12
13
14 /**
15 * @sample groupBySample
16 */
foonull17 fun foo() {
18
19 }