| 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() { | |
| } |