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.