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  3. Foundations of Functional Programming with purrr
  • 1

    Simplifying Iteration and Lists With purrr

    Gratuito

    Iteration is a powerful way to make the computer do the work for you. It can also be an area of coding where it is easy to make lots of typos and simple mistakes. The purrr package helps simplify iteration so you can focus on the next step, instead of finding typos.

  • 2

    More complex iterations

    purrr is much more than a for loop; it works well with pipes, we can use it to run models and simulate data, and make nested loops!

  • 3

    Troubleshooting lists with purrr

    Like anything in R, understanding how to troubleshoot issues is an important skill set. This can be particularly important with lists, where finding the problem can be tricky.

  • 4

    Problem solving with purrr

    Now that you have the building blocks, we will start tackling some more complex data problems with purrr.

Initializing

Exercicio

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

Instruções 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.