Hands-On Data Science with R

Quiz

1. Quiz-tion: What is the output of the command lapply from the apply family of functions
   1. List
   2. Matrix
   3. A list and a matrix
2. Quiz-tion: Which of the following options best describes the functionality of fread in data.table?
   1. To load functions from a file
   2. To load a delimited file
   3. To load comma-separated (csv) files with embedded R functions

3. Quiz-tion: Many data.table functions (set functions) are applied in-place, that is, the functions modify the object without creating a duplicate copy. How can we ensure that our original data.table remains unchanged when applying such operations?
   1. Create a copy of the data.table using the make.data.table command
   2. Create a copy using the copy command in data.table
   3. This is not possible due to restrictions ...