how to ask user input for list of strings - string

Question

I wanna know how to ask user input for a string. For example:
when user input is asked "lruud" is entered
Enter letters: lruud
and I want it the return should be:
Left
right
up
up
down
left = l, right = r, etc.
So basically it should return the result in the order the letters are entered.
The code below is what I have tried where al() is move left, ar() is move right etc
def move(s: String) {
if(s == "l"){
al()
}else if(s == "r"){
ar()
}else if(s == "u"){
au()
}else if(s == "d"){
ad()
}
}

Answer 1

You can read in a string from standard input using
val s = scala.io.StdIn.readLine()
Scala implicitly considers String to be a Scala collection, in particular an IndexedSeq which means you can call standard collections methods on it such as map to transform it. For example
def move(s: Char): String = {
if (s == 'l') "left"
else if (s == 'r') "right"
else if (s == 'u') "up"
else if (s == 'd') "down"
else throw new RuntimeException("Bad input")
}
"lruud".map(move)
// res4: IndexedSeq[String] = ArraySeq(left, right, up, up, down)
Mapping over a String reads each Char in the string and passes it to the move method for transformation.

Answer 2

Here's one way to go about this.
val action :Map[Char,String] =
Map('d'->"down",'l'->"left",'r'->"right",'u'->"up")
.withDefault(c => s"$c?")
val moves :Seq[String] =
io.StdIn.readLine("Enter letters: ").map(c =>action(c.toLower))
println("\ndirections:\n" + moves.mkString(" ","\n ",""))
testing:
Enter letters: lLdRbu
directions:
left
left
down
right
b?
up