### Name: hasArg
### Title: Look for an Argument in the Call
### Aliases: hasArg
### Keywords: programming

### ** Examples

ftest <- function(x1, ...) c(hasArg(x1), hasArg(y2))

ftest(1) ## c(TRUE, FALSE)
ftest(1, 2)  ## c(TRUE, FALSE)
ftest(y2=2)   ## c(FALSE, TRUE)
ftest(y=2)    ## c(FALSE, FALSE) (no partial matching)
ftest(y2 = 2, x=1)  ## c(TRUE, TRUE) partial match x1