CODEWITHSUNDEEP
rfunction
GegznaV
GegznaV

Reputation: 5580

Determine class of every input argument in R function

Consider having a function, that accepts any number of arguments:

FUN <- function(...) { 
   #/some code/
   }

How to determine the classes of input arguments to this function FUN?

library(ggplot2)

g <- qplot(mpg, wt, data = mtcars)
char <- "lalala"
DF <- data.frame(ch)
f <- function(x) x*x

FUN(g, char, DF, "DF", list(), f, `%in%`, NULL, TRUE, "TRUE")

Upvotes: 0

Views: 273

Answers (1)

Zheyuan Li
Zheyuan Li

Reputation: 73265

Possibly this:

FUN <- function(...) {
  elipsis <- list(...)
  print(sapply(elipsis, class))
  ##/some code/
  }

However, you must make sure you are passing in sensible thing. For example:

FUN("lalala", trees, "DF", list(), function(x) x * x, `%in%`, NULL, TRUE, "TRUE")
# [1] "character"  "data.frame" "character"  "list"       "function"  
# [6] "function"   "NULL"       "logical"    "character"

Upvotes: 2

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