kotlin

How can I create a map of the characters of a string and the number of their occurances in Kotlin?

I have a string "Hello World"

I need a Map<Char, Int> which will contain the pairs of each character and the number of times it appears in the string : {H=1, e=1, l=3, o=2,r=1, d=1}

How can I do that without using the traditional for loop?

Solution

  • Do it like this

    val str = "Hello World"
val m: Map<Char, Int> = str.groupingBy { it }.eachCount()

    The maps toString representation will look like this (note the one empty key which is the space character):

    {H=1, e=1, l=3, o=2,  =1, W=1, r=1, d=1}