with_edition: Temporarily change the active readr edition

In readr: Read Rectangular Text Data

Temporarily change the active readr edition

Description

with_edition() allows you to change the active edition of readr for a given block of code. local_edition() allows you to change the active edition of readr until the end of the current function or file.

Usage

with_edition(edition, code)

local_edition(edition, env = parent.frame())

Arguments

edition	Should be a single integer, such as 1 or 2.
code	Code to run with the changed edition.
env	Environment that controls scope of changes. For expert use only.

Examples

with_edition(1, edition_get())
with_edition(2, edition_get())

# readr 1e and 2e behave differently when input rows have different number
# number of fields
with_edition(1, read_csv("1,2\n3,4,5", col_names = c("X", "Y", "Z")))
with_edition(2, read_csv("1,2\n3,4,5", col_names = c("X", "Y", "Z")))

# local_edition() applies in a specific scope, for example, inside a function
read_csv_1e <- function(...) {
  local_edition(1)
  read_csv(...)
}
read_csv("1,2\n3,4,5", col_names = c("X", "Y", "Z"))      # 2e behaviour
read_csv_1e("1,2\n3,4,5", col_names = c("X", "Y", "Z"))   # 1e behaviour
read_csv("1,2\n3,4,5", col_names = c("X", "Y", "Z"))      # 2e behaviour

readr documentation built on May 29, 2024, 2:37 a.m.