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Get a New Temporary Variable Name for a Dataset

Source: R/tmp_vars.R
get_new_tmp_var.Rd

Get a New Temporary Variable Name for a Dataset

Usage

get_new_tmp_var(dataset, prefix = "tmp_var")

Arguments

dataset

The input dataset

Default value

none

prefix

The prefix of the new temporary variable name to create

Default value

"tmp_var"

Value

The name of a new temporary variable as a symbol

Details

The function returns a new unique temporary variable name to be used inside dataset. The temporary variable names have the structure prefix_n where n is an integer, e.g. tmp_var_1. If there is already a variable inside datset with a given prefix then the suffix is increased by 1, e.g. if tmp_var_1 already exists then get_new_tmp_var() will return tmp_var_2.

See also

remove_tmp_vars()

Examples

library(dplyr, warn.conflicts = FALSE)
dm <- tribble(
  ~DOMAIN,  ~STUDYID,      ~USUBJID,
  "DM",    "STUDY X", "01-701-1015",
  "DM",    "STUDY X", "01-701-1016",
)

tmp_var <- get_new_tmp_var(dm)
mutate(dm, !!tmp_var := NA)
#> # A tibble: 2 × 4
#>   DOMAIN STUDYID USUBJID     tmp_var_1
#>   <chr>  <chr>   <chr>       <lgl>    
#> 1 DM     STUDY X 01-701-1015 NA       
#> 2 DM     STUDY X 01-701-1016 NA