R function with no return value

Question

I was helping a friend of mine with some of his code. I didn\'t know how to explain the strange behavior, but I could tell him that his functions weren\'t explicitly returni

Answer 1

If you want a function to change the value of a variable in Global environment you can use <<- operator, but you still need to write the exact name of a variable in Global environment

derp <- function(arg){
  arg <- arg+3
  b<<-3
}

Try it and call b