Scala: extract each value for each key in a Map using for loop

Question

I am trying to extract the values from the keys v1 and v2.

I would like it to print like this

first the v1

900
1800

and then v2

700
800
2600
1800
2100

This is how far I have done but I get an error in my second for loop that I do not know how to solve. Is this write scala approach to solve this or is there a better way?

     val some_numbers = Map("v1"->(900, 1800),
                            "v2"->(700, 800, 2600, 1800, 2100))
     
     for ((key,values) <-some_numbers) {
       for(value<-values)
         print(value)
     }

Like this: scastie.scala-lang.org/BalmungSan/7e0qTtAaRAq2G8TFrGjlGg ? — Luis Miguel Mejía Suárez
– Luis Miguel Mejía Suárez, Commented Dec 30, 2021 at 17:48
It is very very unlikely that you really want to have a map with tuple values of different sizes. See the type of the map, it will be Map[String, Product], quite useless. You probably misunderstand the usage of tuples here. — V-Lamp
– V-Lamp, Commented Dec 30, 2021 at 19:18

gianluca aguzzi · Accepted Answer · 2021-12-30 16:27:31Z

2

You cannot iterate directly on a tuple value.

I do not know what is your application need. BTW you can iterate on tuple using productIterator:

 for ((key,values) <-some_numbers) {
   for(value<-values.productIterator) {
     println(value)
   }
 }

This should work. But probably it is better to use List instead of tuple in this case!

answered Dec 30, 2021 at 16:27

gianluca aguzzi

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