You want to know what variables and functions are defined in your workspace.
To list all variables and functions in your workspace, we use the ls() function.
Let’s define some variables and function to illustrate it.
a <- 5 b <- 10 c <- a + b f <- function(n, p) sqrt(p * (1-p) / n)
Now let;s use the ls() function.
> ls()  "a" "b" "c" "f"
You can also see your variables and functions in the environment pane in RStudio.
If you want more than just a list of names, try the ls.str(). This will also tell you something about each variables.
> ls.str() a : num 5 b : num 10 c : num 15 f : function (n, p)