tests/testthat/_snaps/reduce.md

In purrr: Functional Programming Tools

empty input returns init or error

Code
  reduce(list())
Condition
  Error in `reduce()`:
  ! Must supply `.init` when `.x` is empty.

accumulate() does fail when simpification is required

Code
  accumulate(list(1, "a"), ~.y, .simplify = TRUE)
Condition
  Error in `accumulate()`:
  ! Can't combine `res[[1]]` <double> and `res[[2]]` <character>.

requires equal length vectors

Code
  reduce2(1:3, 1, `+`)
Condition
  Error in `reduce2()`:
  ! `.y` must have length 2, not 1.

requires init if .x is empty

Code
  reduce2(list())
Condition
  Error in `reduce2()`:
  ! Must supply `.init` when `.x` is empty.

purrr documentation built on Nov. 5, 2025, 7:27 p.m.