[ippisl]

Research has shown that rapid feedback is a needed element in rapid learning. this has been proven true in many fields. REPL gives you this.

And from my experience , with a REPL , making things is easier and faster.

And in languages without a REPL , the barrier to explain something is bigger(you have to write a lot of cruft code) , so it might make more sense to build something rather than showing language features.