chartjs: R Interface to Chart.js

Description Usage Arguments Details Value Examples

Check that the arguments passed for a parameter are in a set of valid values, and throw a warning & return a default value if validation fails.

1	check_arg(arg, name, val, validVals, silent = FALSE)

`arg`	The parameter name to validate values for (character scalar).
`name`	The name of the current loop variable (character scalar).
`val`	The value of the current loop variable.
`validVals`	A vector/list of the valid values that the parameter can take.
`silent`	Whether to silence the warning that usually appears when validation fails (boolean scalar).

This is an internal function meant to be called unconditionally inside a loop. It will only perform validation if arg == name.

If ! val %in% validVals, validVals[1] will be returned, else val.

# Valid value, "apple" is returned
check_arg("fruit", "fruit", "apple", c("apple", "banana", "cherry"))

# Invalid value, "banana" is returned
check_arg("fruit", "fruit", "apple", c("banana", "cherry"), silent = TRUE)

# Throws a warning
## Not run: 
  check_arg("fruit", "fruit", "apple", c("banana", "cherry"))

## End(Not run)