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Introduction
The lapply() function
Other apply() functions
The split-apply-combine pattern
21. lapply() + unlist()
Summary

Instruction

Great!

Exercise

What's the average price for each of Alex's three expenses (plane ticket, accommodations, daily expenses)? Follow these steps:

  1. Group the prices from the alex_trips data frame by the cost_type column. Save the results in a variable named alex_trip_costs_list.
  2. Use lapply() in combination with unlist() to display the result.