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  3. Foundations of Functional Programming with purrr

Exercise

More iteration with for loops

Iteration isn't just for reading in files though; iteration can be used to perform other actions on objects. First, you will try iterating with a for loop.

You're going to change each element of a list into a numeric data type and then put it back into the same element in the same list.

For this exercise, you will iterate using a for loop that takes list_of_df, which is a list of character vector, but the characters are actually numbers! You need to change the character vectors to numeric so that you can perform mathematical operations on them; you can use the base R function, as.numeric() to do that.

Instructions

100 XP
  • Check the class type of the first element of list_of_df.
  • Build a for loop that takes each element of list_of_df, changes it into numeric data with as.numeric(), and adds it back into the same element of list_of_df.
  • Check the class type of the first element of list_of_df.
  • Print list_of_df.