try-catch

I seem to forget exact punctuation in R and need a few tries to get it right. TryCatch is one example!

The trick is use formatting so things wrong will stick out. Rahul !so 12193779 has excellent example: Note the use of curly braces {} as well as parenthesis () https://stackoverflow.com/q/12193779/5057251 https://stackoverflow.com/a/53876586/5057251

Code

log_calculator <- function(x){
    tryCatch(
        expr = {
            message(log(x))
            message("Successfully executed the log(x) call.")
        },
        error = function(e){
            message('Caught an error!')
            print(e)
        },
        warning = function(w){
            message('Caught an warning!')
            print(w)
        },
        finally = {
            message('All done, quitting.')
        }
    )    
}

log_calculator(10)
log_calculator("10")
....-> <simpleError in log(x): non-numeric argument to mathematical function>