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1. Apply functions
The lapply() function
Other apply() functions
The split-apply-combine pattern


In the last part, we learned how to create our own functions and how to invoke them. In this part, we'll learn how to apply functions to more object members at once. We'll learn how to apply a function to many list, vector, or data frame members with just a single line of code. We'll get to know a very important family of functions named apply(). Let's waste no time and jump right in!


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