R/compat-purrr.R

In sugrrants: Supporting Graphs for Analysing Time Series

# nocov start - compat-purrr (last updated: rlang 0.1.9000)

# This file serves as a reference for compatibility functions for
# purrr. They are not drop-in replacements but allow a similar style
# of programming. This is useful in cases where purrr is too heavy a
# package to depend on. Please find the most recent version in rlang's
# repository.

map <- function(.x, .f, ...) {
  lapply(.x, .f, ...)
}

map_mold <- function(.x, .f, .mold, ...) {
  out <- vapply(.x, .f, .mold, ..., USE.NAMES = FALSE)
  names(out) <- names(.x)
  out
}

map_lgl <- function(.x, .f, ...) {
  map_mold(.x, .f, logical(1), ...)
}

map_int <- function(.x, .f, ...) {
  map_mold(.x, .f, integer(1), ...)
}

map_dbl <- function(.x, .f, ...) {
  map_mold(.x, .f, double(1), ...)
}

map_chr <- function(.x, .f, ...) {
  map_mold(.x, .f, character(1), ...)
}

map2 <- function(.x, .y, .f, ...) {
  Map(.f, .x, .y, ...)
}

map2_lgl <- function(.x, .y, .f, ...) {
  as.vector(map2(.x, .y, .f, ...), "logical")
}

map2_int <- function(.x, .y, .f, ...) {
  as.vector(map2(.x, .y, .f, ...), "integer")
}

map2_dbl <- function(.x, .y, .f, ...) {
  as.vector(map2(.x, .y, .f, ...), "double")
}

map2_chr <- function(.x, .y, .f, ...) {
  as.vector(map2(.x, .y, .f, ...), "character")
}

reduce <- function(.x, .f, ..., .init) {
  f <- function(x, y) .f(x, y, ...)
  Reduce(f, .x, init = .init)
}
# nocov end