.udfExists: See if the UI function exists in given environment.
Description
If other functions have been declared, make sure they exist too.
Usage
.udfExists(fun, nargs, envir, doList = TRUE)
Value
logical declaring if the udf function exists in this environment
Arguments
- fun
Function to check
- nargs
Number of args to check
- envir
Environment to check
- doList
A boolean to see if the functions in .udfEnv$fun
should be checked too. By default TRUE, but this is called
recursively for each function (and set to FALSE)