R4DS-2e Ch. 24

select()

{dplyr}

keep specified columns

library()

{base}

load R packages

mutate()

{dplyr}

create or modify data columns

str_replace_all()

{stringr}

replace all matched patterns in a string

tibble()

{tibble}

create tibble

parse_date()

{readr}

parse date

c()

{base}

create vector of numbers, characters, etc.

parse_number()

{readr}

parse a character vector to numbers

head()

{utils}

return first rows of matrix, data frame, etc.

The end!