R function: substitute

typeof, class, mode

The type of the value returned by substitute is "language", the class and mode is "call":

s <- substitute( sin(x) ^ 2 + cos(y) )

typeof(s)
#
# [1] "language"

class (s)
#
# [1] "call"

mode  (s)
#
# "call"

These returned strings are the same as those returned by quote.