Kotlin
Kotlin
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kotlin.text.groupingBy

groupingBy

kotlin-stdlib / kotlin-text - 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.