R4DS-2e Ch. 23

I()

{base}

inhibit interpretation/conversion of objects

tibble()

{tibble}

create tibble

pivot_longer()

{tidyr}

pivot data frame to be longer

unnest_wider()

{tidyr}

turn each element of a list-column into a column

library()

{base}

load R packages

head()

{utils}

return first rows of matrix, data frame, etc.

read_json()

{jsonlite}

read JSON file from disk

select()

{dplyr}

keep specified columns

rename()

{dplyr}

rename columns

data.frame()

{base}

create data frame

identical()

{base}

safe and reliable way to test if two objects are exactly equal

hoist()

{tidyr}

pull components of a list-column out into their own top-level columns

str()

{utils}

return object structure

list()

{base}

create recursive vector (list)

tribble()

{tibble}

create row-wise tibble

parse_json()

{jsonlite}

create JSON file from string

names()

{base}

return (and can assign) column names

filter()

{dplyr}

keep rows based on values of columns

unnest_longer()

{tidyr}

turn each element of a list-column into a row

c()

{base}

create vector of numbers, characters, etc.

The end!