Welcome to Purrr Package!

Installation

# The easiest way to get purrr is to install the whole tidyverse:install.packages("tidyverse")
# Alternatively, install just purrr:install.packages("purrr")

Content of Tutorial

Functional iteration across elements of one or more vectors or lists

The best place to start is the family of map() functions which allow you to replace many for loops with code that is both more succinct and easier to read.

• map() applies a function to each element of a vector or list, and returns a list. Its variant functions map_lgl(), map_int(), and map_chr() returns a vector of the indicated type.

• map2() applies a function to each paired elements of two inputs (vector or list). Its variant functions map2_lgl(), map2_int(), and map2_chr() returns a vector of the indicated type.

• pmap() applies a function to elements of multiple inputs in parallel. Its variant functions pmap_lgl(), pmap_int(), and pmap_chr() returns a vector of the indicated type.

Getting or setting a single element.

• pluck() is a generalized form of [[ ]] that extracts elements from nested data structure.

• pluck_depth() calculates the level of nesting.

• pluck_exists() checks if the specified element is present or not.

• chuck() is like pluck() but returns an error for non-existing elements to be extracted.