The nitpicky take: a lot of these languages come with a repl / console. E.g. the most recent version of Scala builds Scala CLI[1] into the language. You can run `scala repl` and just type code into it, or run `scala SomeFile.scala` and it will compile and run `SomeFile.scala`. There is special syntax for writing dependencies so that a single file can pull in the libraries it needs.
The 5head thought leader take: the traditional model for typed languages has two phases: compile time and run time. Types exist at compile time. This is inadequate for many applications, particularly interactive ones. E.g. a data scientist doesn't know the shape (type) of the data until it is loaded. It should be possible to infer the type from the data once it is loaded and make that type available to the rest of the program. We know how to do this (it's called staging) but it's just not available in the vast majority of languages. Staging, and metaprogramming in general, is perhaps the next great innovation in programming languages (which will take us from ML to Lisp).
In general, the challenge for these new languages is to reach "down" into the simpler scriptier applications, instead of the "serious" programming they are usually built for.
The nitpicky take: a lot of these languages come with a repl / console. E.g. the most recent version of Scala builds Scala CLI[1] into the language. You can run `scala repl` and just type code into it, or run `scala SomeFile.scala` and it will compile and run `SomeFile.scala`. There is special syntax for writing dependencies so that a single file can pull in the libraries it needs.
The 5head thought leader take: the traditional model for typed languages has two phases: compile time and run time. Types exist at compile time. This is inadequate for many applications, particularly interactive ones. E.g. a data scientist doesn't know the shape (type) of the data until it is loaded. It should be possible to infer the type from the data once it is loaded and make that type available to the rest of the program. We know how to do this (it's called staging) but it's just not available in the vast majority of languages. Staging, and metaprogramming in general, is perhaps the next great innovation in programming languages (which will take us from ML to Lisp).
In general, the challenge for these new languages is to reach "down" into the simpler scriptier applications, instead of the "serious" programming they are usually built for.
[1]: https://scala-cli.virtuslab.org/