For example I have a list of strings like:
val list = listOf("a", "b", "a", "b" "a" "c") and I need to convert it to a Map, where the strings are the keys and values are count of repetitions. So i have to got Map like [a = 3] [b = 2] [c = 1]
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1 Answer
val list = listOf("a", "b", "a", "b", "a", "c")
val result = list.groupingBy { it }.eachCount()
// result is Map<String, Int> looking like this: {a=3, b=2, c=1}
Edit: for counts bigger than 1 add a filter condition to the map
val result = list.groupingBy { it }.eachCount().filter { it.value > 1 }
// result is now: {a=3, b=2}
1 Comment
Aleksandr Wake
thank you, and what if I need only pairs, where values > 1