Exercise

# Foldable operations (I)

An operation that gives the same answer whether you apply it to an entire data set or to chunks of a data set and then on the results on the chunks is sometimes called *foldable*. The `max()`

and `min()`

operations are an example of this.
Here, we have defined a foldable version of the `range()`

function that takes either a vector or list of vectors.
Verify that the function works by testing it on the mortgage data set.

Instructions

**100 XP**

- Verify that
`foldable_range()`

works on the`"record_number"`

column of the`mort`

data set.