if_col_present: Execute a function or return a value if a column in present...

In interfacer: Define and Enforce Contracts for Dataframes as Function Parameters

Execute a function or return a value if a column in present in a dataframe

Description

The simple use case. For more complex behaviour see switch_pipeline().

Usage

if_col_present(df, col, if_present, if_missing = ~.x)

Arguments

df	a dataframe
col	a column name
if_present	a purrr style function to execute on the dataframe if the column is present (or a plain value)
if_missing	a purrr style function to execute on the dataframe if the column is missing (or a plain value)

Value

either the value of if_present/if_absent or the result of calling if_present/if_absent as functions on df.

Examples

iris %>% if_col_present(Species, ~ .x %>% dplyr::rename(new = Species)) %>%
  colnames()

# in contrast to `purrr` absolute values are not interpreted as function names  
iris %>% if_col_present(Species2, "Yes", "No")

interfacer documentation built on April 4, 2025, 6:13 a.m.