I don't see how lodash could possibly filter a list of 30 by a criteria without visiting each item at least once to take a look at it. the only way to make it more efficient would be to have lodash collect the desired transformations (filter/map) and then run a single loop over the items, mapping only those items that meet the filter criteria. But that is not much more efficient than the [].filter().map() that you could do with native methods.

It doesn't have to visit all 30 items, just enough items to take 5 from, could be 8, could be 10 etc. The lazy approach _is_ to collect all transformations and apply them in the end.

ah, yeah you are right.