reduce

From purrr v0.2.2.2 by Lionel Henry

Reduce a list to a single value by iteratively applying a binary function.

reduce combines from the left, reduce_right combines from the right.

Usage

reduce(.x, .f, ..., .init)
reduce_right(.x, .f, ..., .init)

Arguments

.x: A list or atomic vector.
.f: A two-argument function.
...: Additional arguments passed on to .f.
.init: If supplied, will be used as the first value to start the accumulation, rather than using x[[1]]. This is useful if you want to ensure that reduce returns the correct value when .x is is_empty().

Examples

# NOT RUN {
1:3 %>% reduce(`+`)
1:10 %>% reduce(`*`)

5 %>%
  replicate(sample(10, 5), simplify = FALSE) %>%
  reduce(intersect)

x <- list(c(0, 1), c(2, 3), c(4, 5))
x %>% reduce(c)
x %>% reduce_right(c)
# Equivalent to:
x %>% rev() %>% reduce(c)

# Use init when you want reduce to return a consistent type when
# given an empty lists
list() %>% reduce(`+`)
list() %>% reduce(`+`, .init = 0)
# }

Documentation reproduced from package purrr, version 0.2.2.2, License: GPL-3 | file LICENSE

Community examples

Looks like there are no examples yet.