// strings can be thought of as a sequence of characters
val s = "howdy"

// valid indices
println(s.indices)

// get a letter
println(s[0])
println(s[ s.length-1 ])

// get a substring
println(s.substring(1..2))

// detect a substring
println("h" in s)
println("how" in s)
println("howdo" in s)

// we can also convert to/from lists
val l = s.toList()

println(l)
println(l.joinToString(""))

// and... abstractions :)

fun isVowel(c: Char): Boolean {
    return c.uppercase() in "AEIOUY"
}

println(s.filter(::isVowel))

"YMCA".forEach(::println)

// so much more...
// https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/