[R] chaining closure arguments on-the-fly

Benjamin Tyner btyner @end|ng |rom gm@||@com
Sat Jun 20 13:15:28 CEST 2020


Occasionally, I desire to call a function with one argument set to equal 
to another. Here is a toy example:

    f <- function(x, y) {

        x + y

    f(x = 3, y = x) # Error in f(x = 3, y = x) : object 'x' not found

So far, the most concise way I found to accomplish this is:

    f(x = 3, y = local(sys.frame(1)$x)) # evaluates to 6

but I dislike this solution because local() creates a new environment. 
Surely there must be a better way?

Note: I'm not interested in solutions that require modifying or currying f.


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