ftype                   Determine function type.
is_s3_generic           Determine if a function is an S3 generic or S3
                        method.
otype                   Determine the type of an object
s3_class                Compute the S3 class of an object
s3_dispatch             Illustrate S3 dispatch
s3_get_method           Find S3 method from its name
s3_methods_class        List methods for a S3 or S4 generic (or class)
