kotlin.text.groupingBy
groupingBy
inline fun <K> CharSequence.groupingBy( crossinline keySelector: (Char) -> K ): Grouping<Char, K>
Platform and version requirements: Kotlin 1.1
Creates a Grouping source from a char sequence to be used later with one of group-and-fold operations using the specified keySelector function to extract a key from each character.
© 2010–2017 JetBrains s.r.o.
Licensed under the Apache License, Version 2.0.
https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.text/grouping-by.html