1.
Modify the TweetFrame() function created at the beginning of this chapter to sort the dataframe based on the creation time of the tweets. This will require taking the line of code from a few pages ago that has the order() function in it and adding this to the TweetFrame() function with a few minor modifications. Here’s a hint: Create a temporary dataframe inside the function and don’t attach it while you’re working with it. You’ll need to use the $ notation to access the variable you want to use to order the rows.
