purrr (version 0.2.1)

split_by: Split, order and sort lists by their components.

Description

Split, order and sort lists by their components.

Usage

split_by(.x, .f, ...)
order_by(.x, .f, ...)
sort_by(.x, .f, ...)

Arguments

.x

A list or atomic vector.

.f

A function, formula, or atomic vector.

If a function, it is used as is.

If a formula, e.g. ~ .x + 2, it is converted to a function with two arguments, .x or . and .y

...

Additional arguments passed on to .f.

Examples

l1 <- transpose(list(x = sample(10), y = 1:10))
l1
l1 %>% order_by("x")
l1 %>% sort_by("x")

l2 <- rerun(5, g = sample(2, 1), y = rdunif(5, 10))
l2 %>% split_by("g") %>% str()
l2 %>% split_by("g") %>% map(. %>% map("y"))