[R] modify the supposed return value of a function during evaluation?

Jeremie Juste jeremieju@te @ending from gm@il@com
Fri Sep 14 10:33:53 CEST 2018


I'm wondering it is possible and if yes would it be desirable to modify
the return value of functions during evaluation.

I supposed this would be very useful during debugging

myfun <- function(x) {res <- x+3 ; browser()  ; res}

let say I run the following function myfun(3)  and drop in the browser. I then happened to notice that I should 
multiply <x> by 3 instead of adding. I was thinking to do return(x*3)
but the return value is still 6.

> myfun(3)
Called from: myfun(3)
debug at #1: res
Browse[2]> return(3*3)
[1] 6

This feature could be valuable if the following setting

        tmp_res <- time_consuming_function_with_browser(param)


Best regards,


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