davharris/wat.R

## wat.R
f = function(x){
  x
}

f()  # Throws error: x is missing

g = function(x){
  letters[x]
}

g(1) # Returns the first element of letters
g()  # Doesn't throw error, returns ALL elements of letters
	f = function(x){
	x
	}

	f() # Throws error: x is missing

	g = function(x){
	letters[x]
	}

	g(1) # Returns the first element of letters
	g() # Doesn't throw error, returns ALL elements of letters