isJavaIdentifierStart
Returns true if this character is permissible as the first character in a Java identifier.
inline fun Char.isJavaIdentifierStart(): Boolean(source)
fun main() {
val c = '3'
if (c.isJavaIdentifierStart()) {
println("$c is a valid starting character for a Java identifier")
} else {
println("$c is NOT a valid starting character for a Java identifier")
}
}