Still with software science translations.. Now I'm coming to you with this expression that have always bothered me: "on the fly"

How the hood would you translate that *elegantly* to spanish?

It feels like "sobre la marcha" is way overkill, at least from a structure point of view. Also "al toque", sounds maybe too coloquial.

What do you think?

edit: so the english sentence could be:

> 
> The value is returned from a new function executed on the fly.
> 
> 
>
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I would generally use *sobre la marcha* and I don't see it as overkill.

What does this phrase have to do with Scientific translations? Maybe a few examples would help.
I'm from Latin America and "al toque" doesn't mean exactly "on the fly", the correct translation would be "sobre la marcha".

"Al toque" it's more like a "immediately after".