What can make scala more popular?

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I like your questions. Of course I have no answer for these in general.
But for me personally:

I can see one general area for scala. It is fast reliable data processing.
Because this area requires custom types for each sub domain areas and big performance.
IMHO:The ability to comfortably use custom types with standard libraries without performance overhead is the most powerful feature of scala which is absent in other languages which I have known.

I know only one disadvantage of scala in that area in general. It is a lack of structural types(index-based)

  1. create custom types
    I do not like types from external sources because they lead to orphan tasks which have no good decision.
  2. intergrate custom types with external scala libraries
  3. decorate jvm libraries which you often need.
  4. enjoy scala

May be there are different ways. But I do not know area where I will choose scala when I do not need custom types. It seems I will prefer java or kotlin where standard jvm types are enough.
Scala has beautiful string interpolation but I do not prefer plain jvm types in the areas where it is really a very important feature for me.

      val guid = g"1322030"
      for(v <-SQL"""select id from  table t where t.guid= ${guid}
            """.as(nStr("id").*).sortBy(_.desc) if v.isNotNull){
         ...
      }

all together with type safety:

  • collections
  • for comprehension
  • string interpolation
  • custom types without overhead
  • null safety
  • external libraries
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