You can check any assumptions about the code. But it's not exactly like using browser's dev tools console. First — you don't have to type things "somewhere else" — you're doing it right where you're writing code. And it can be a file or a scratch buffer — you don't even have to save those experimental bits. Second — because you have things neatly wrapped into symbolic expressions (those pesky parens that non-lispers find so confusing), you don't need any ceremony for setting up the stage.

take this Javascript example:

    function addFive(x) { return x + 5; }
    

or

    const addFive = (x) => x + 5;

And its counterpart in Clojurescript:

    (defn add-five [x] (+ x 5))

In javascript REPL you can eval the entire thing, but try doing it piecemeal - it makes little sense, i.e., what is (x) or => from js perspective, semantically? While Clojure variant already is a list - a native data-structure, the argument is just a vector - another native thing, etc.

So that infamous code-is-data & data-is-code mantra may not seem like a big deal in a trivial example like this, in practice, it's very nice, it allows you to do things otherwise difficult to achieve, watch this video https://www.youtube.com/watch?v=nEt06LLQaBY and give it a thought, how does one build something like that and how using a Lispy language helps there, while using more traditional PL would make things much more difficult.