how to get sum of vowels in list in kotlin-CodePudding

i need to get sum of vowels from list of strings with help function .fold

i tried:

val student = listOf("Sheldon", "Leonard", "Howard", "Raj", "Penny", "Amy", "Bernadette")

val vowels = setOf('a','A','e','E','i','I','o','O','y','Y','u','U')

val sumVowels = student.fold(0){acc, student, ->
if(student.contains(vowels)) acc   1 else acc   0

I don't know how to place vowels in .contains. Maybe I choose not the right way to solve the problem, but I should use fold anyway

CodePudding user response：

val list = listOf("Sheldon", "Leonard", "Howard", "Raj", "Penny", "Amy", "Bernadette")
val vowels = setOf('a', 'A', 'e', 'E', 'i', 'I', 'o', 'O', 'y', 'Y', 'u', 'U')

val result = list
  .joinToString("")
  .count { char -> char in vowels }

println(result)   // Output: 16

CodePudding user response：

you can write

val sumVowels = student.fold(0){acc, s -> acc   s.count{it in vowels}}