Ok: Create an 'Ok' Result
In matchr: Pattern Matching and Enumerated Types in R

Description Usage Arguments Value Examples

Create an Enum variant of Result used to denote that function did not contain an error. This allows the creation of safer functions.

Ok(x)

`x`	Object to be wrapped in the Enum variant.

a list with a single value x and classes "Result} and \code{"Enum

grepl_safe <- function(pattern, x)
{
  if (!is.character(pattern)){ return(Err("'pattern' in 'grepl_safe' was not a character value.")) }
  if (!is.character(x)){ return(Err("'x' in 'grepl_safe' was not a character value.")) }
  Ok(grepl(pattern, x))
}

#grepl_safe(123, 1:5)