CODEWITHSUNDEEP
stringscalalistcharscala-collections
undisp
undisp

Reputation: 721

Scala - Duplicate char and increment it's value

I want to code a Scala function that takes a list of Strings and in each string it duplicates each character and increments it«s value by one like so:

def diplicateAndIncrementChar(l: List[String]): List[String] = {
   // (...)
}

diplicateAndIncrementChar(List("ROAD", "BALL", "LEMON"))
//> res50: List[String] = List(RSOPABDE, BCABLMLM, LMEFMNOPNO)

The trick is that I have to do this in a single statement.

I thought about using map and did this:

l.map(s => new String(s.map(c => (c+1)).toString()))

But it doesn't give exactly the result that I want:

//> res10: List[String] = List(Vector(83, 80, 66, 69), Vector(67, 66, 77, 77), Vector(77, 70, 78, 80, 79))

Can anyone help me with this problem?

Upvotes: 0

Views: 289

Answers (1)

Cyrille Corpet
Cyrille Corpet

Reputation: 5315

Since your input and your output are list of chars of different sizes, you probably want to use flatMap, instead of map.

By the way (c: Char + 1) is an Int, so you'll have to convert it explicitly back to Char to get what you want.

I won't say more, since this should be enough for you to find out the rest by yourself.

Upvotes: 3

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