isLetter
Returns
true
if this character is a letter.
A character is considered to be a letter if its category is CharCategory.UPPERCASE_LETTER , CharCategory.LOWERCASE_LETTER , CharCategory.TITLECASE_LETTER , CharCategory.MODIFIER_LETTER , or CharCategory.OTHER_LETTER .
import java.util.*
import kotlin.test.*
fun main(args: Array<String>) {
//sampleStart
val chars = listOf('a', 'β', '+', '1')
val (letters, notLetters) = chars.partition { it.isLetter() }
println(letters) // [a, β]
println(notLetters) // [+, 1]
//sampleEnd
}