| <div class='api-docs-breadcrumbs'><a href="index.html">test</a> / <a href="./foo.html">foo</a></div> |
| <h1>foo</h1> |
| <a name="$foo()"></a> |
| <div class="signature"><code><span class="keyword">fun </span><span class="identifier">foo</span><span class="symbol">(</span><span class="symbol">)</span><span class="symbol">: </span><span class="identifier">Unit</span></code></div> |
| <div class="sample"><pre><code class="lang-kotlin"> |
| |
| fun main(args: Array<String>) { |
| //sampleStart |
| val words = listOf("a", "abc", "ab", "def", "abcd") |
| val byLength = words.groupBy { it.length } |
| |
| println(byLength.keys) // [1, 3, 2, 4] |
| println(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 |
| println("mutableByLength == byLength is ${mutableByLength == byLength}") // true |
| //sampleEnd |
| }</code></pre></div> |
