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  3. Foundations of Functional Programming with purrr

Exercise

map_dbl() and map_int()

Some flavors of map_*() are very similar. map_dbl() and map_int() both output numbers. map_int() outputs integer vectors, which have numbers with no decimals. map_dbl() outputs double vectors, which have numbers that can have decimals. Take a closer look at how using different map_*() functions affect outputs.

Here is the map_*() table again as a reference.

map_*() Output
map_chr() character vector
map_lgl() logical vector [TRUE or FALSE]
map_int() integer vector
map_dbl() double vector

Instructions 1/2

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  • 1

    Compare the map() and map_dbl() outputs for pulling out the episode_id for each element of sw_films.

  • 2

    Compare the map() and map_int() outputs for pulling out the episode_id for each element of sw_films.