The first version stops as soon it encounters the first item in the
collection that's too big.
The second version filters the whole collection, which may lead to a
major slowdown, depending on coll's relative size. It will also hang
if coll is infinite.
This should be better: (take-while #(<= % limit) coll)

That said, a properly written loop will always be faster that an
idiomatic version using first-order functions.

On Jul 22, 12:17 am, nil <ache...@gmail.com> wrote:
> Oh right. What you said is what I meant. I renamed the functions
> improperly and then fooled myself. But I still can't figure out why
> the second one is much slower.

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