how use functional programming in scala function

Question

I am developing translate function in Scala. It consists to insert the "av" character, just before a vowel-like 'a' , 'e' , 'i', 'o' or 'u'. Note that text string has length restrictions. It should not has a length of more than 225 characters and if it's empty, it should return an empty string: In another world: if

text = "abdcrfehilmoyr"

the result should be : "avabdcrfehavilmavoyr"

So, I developed this function :

def translate(text: String): String = {
  var voyelle = Array('a', 'e', 'i', 'o', 'u')
  for (w <- (0,text.length())){
    if ((text.contains(voyelle[w]) == true)) {
      text.patch(w, "av", 0)
    }
  }
}

Is there a way, to use instead functional programming like map, flat map functions to simplify the code ?

This code doesn't compile as-is - the for(w <- (0,text.length())) doesn't work like this. — James Whiteley
– James Whiteley, Commented Jan 20, 2022 at 13:44
Yes, you can use flatMap that is all you asked, hope you can find the answer. — Luis Miguel Mejía Suárez
– Luis Miguel Mejía Suárez, Commented Jan 20, 2022 at 13:45
What do you want to optimize / simplify for? As it stands the question is rather option-based and unlikely to generate a definitive answer. — k0pernikus
– k0pernikus, Commented Jan 20, 2022 at 13:45
@k0pernikus, I am beginner in scala, thank you if you can give me complete answer — Imed
– Imed, Commented Jan 20, 2022 at 13:47
@k0pernikus Asking specific "how-to" questions is not on-topic for CodeReview. — user673679
– user673679, Commented Jan 20, 2022 at 13:55

Guru Stron · Accepted Answer · 2022-01-20 22:05:23Z

6

String is effectively a collection of char's so you can treat it like one. For example:

val result = text
  .map(c => if (voyelle.contains(c)) "av" + c else c.toString)
  .mkString

edited Jan 20, 2022 at 22:05

answered Jan 20, 2022 at 13:49

Guru Stron

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2 Comments

Imed Over a year ago

Hello @Guru Stron, thank you for the response, but, your code adds "av" after the vowel, I am looking to add "av" before the vowel and not after it.

Guru Stron Over a year ago

@Imed there was small typo. Try it out.

Dima · Accepted Answer · 2022-01-20 14:02:26Z

4

How about

   text.replaceAll("([aeiou])", "av$1")

answered Jan 20, 2022 at 14:02

Dima

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Comments

Luis Miguel Mejía Suárez · Accepted Answer · 2022-01-20 13:57:11Z

2

You can just use flatMap

def translate(text: String): String = {
  val vowels = Set('a', 'e', 'i', 'o', 'u')
  text.trim.toLowerCase.flatMap { c =>
    if (vowels.contains(c)) s"av${c}"
    else c.toString
  }
}

code running here.

answered Jan 20, 2022 at 13:57

Luis Miguel Mejía Suárez

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