Enumeration ArgProp

the result is this argument, handed back unchanged, like x in identity(x); this is what draws the Returns edge

the result is one of this argument's values, like choices in match.arg(arg, choices). The bounding argument of a CallProp.Narrows call; without one such a call yields a value of its own making.

called as a function, like FUN in lapply(x, FUN)

selects a behavior instead of carrying data, like na.rm in sum(x, na.rm = TRUE)

evaluated whenever the call happens, even if the result goes unused, like x in force(x)

quoted or evaluated in another frame, like expr in quote(expr)

only whether it was supplied matters, as with missing()

names the resource the call reads or writes, like file in write.csv(x, file)

only the shape is used (length, dimensions, names, other attributes), like x in nrow(x)

the result is computed from the argument's value, like x in sum(x)

what it refers to may be modified, like envir in assign(x, v, envir = e)