kotlin-stdlib / kotlin.collections / eachCount

eachCount

Common
JVM
Native
1.0
fun <T, K> Grouping<T, K>.eachCount(): Map<K, Int>
(Common source) (JVM source) (Native source)

Groups elements from the Grouping source by key and counts elements in each group.



fun main(args: Array<String>) {
//sampleStart
val words = "one two three four five six seven eight nine ten".split(' ')
val frequenciesByFirstChar = words.groupingBy { it.first() }.eachCount()
println("Counting first letters:")
println(frequenciesByFirstChar) // {o=1, t=3, f=2, s=2, e=1, n=1}

val moreWords = "eleven twelve".split(' ')
val moreFrequencies = moreWords.groupingBy { it.first() }.eachCountTo(frequenciesByFirstChar.toMutableMap())
println(moreFrequencies) // {o=1, t=4, f=2, s=2, e=2, n=1}
//sampleEnd
}

Return a Map associating the key of each group with the count of elements in the group.

JS
1.1
fun <T, K> <ERROR CLASS><T, K>.eachCount(): Map<K, Int>
(source)

Groups elements from the Grouping source by key and counts elements in each group.



fun main(args: Array<String>) {
//sampleStart
val words = "one two three four five six seven eight nine ten".split(' ')
val frequenciesByFirstChar = words.groupingBy { it.first() }.eachCount()
println("Counting first letters:")
println(frequenciesByFirstChar) // {o=1, t=3, f=2, s=2, e=1, n=1}

val moreWords = "eleven twelve".split(' ')
val moreFrequencies = moreWords.groupingBy { it.first() }.eachCountTo(frequenciesByFirstChar.toMutableMap())
println(moreFrequencies) // {o=1, t=4, f=2, s=2, e=2, n=1}
//sampleEnd
}

Return a Map associating the key of each group with the count of elements in the group.