Purrrfecting our function

We are still perfecting our function to detect if a list of URLs contains elements that are not available.

Let's review what we have coded so far:

An error extractor, by combining safely() and map(.x, "error").
A "non-null" extractor, by combining safely() and discard(.x, is.null).
A 404 generator, by using possibly(.x, otherwise = 404), which was turned into a function.

We'll change the behavior of this function a bit: you now want to be able to choose between returning either the results or the errors.

This will allow you to answer two questions with just one function: which are the unreachable URLs, and which are the reachable ones? To do this, you'll add a parameter called "type" inside this function.

The urls vector and safe_read() are available in your workspace.

Complete the function definition.

Map safe_read() to the list of URLs.
Set the names of the result to the list of URLs.
Transpose the result into a list of $result and $error.
Use pluck() to extract the type element.

Take Hint (-30 XP)

Exercise

Purrrfecting our function

Instructions