reduce

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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().

Aliases
  • reduce
  • reduce_right
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

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