List [26]:

List functors: functors operating on lists.

Stream [6]:

Input/output functors and stream operations.

String [30]:

String functors: functors operating on string arguments.

Constructor [8]:

Functors to construct nontrivial data structures.

Pattern [7]:

Pattern functors: functors operating on patterns.

Coercion [4]:

Scalar coercion unary functors.

Debug [3]:

Debugging functors.

Iterator [10]:

Iterator functors: functors, evaluating argument(s) repeatedly.

Decoder [5]:

Decoding functors (converters of strings to arbitrary data).

Nullary [6]:

Nullary functors: functors not expecting arguments at all.

Numeric [57]:

Numeric functors: functors operating on numeric arguments.

Scalar [67]:

Scalar functors: functors operating on scalar arguments.

Object [5]:

Object/class functors: functors operating on objects and classes.

Eval [6]:

Evaluators: functors to control or affect argument(s) evaluation.

Compare [16]:

Comparators: functors performing data comparison.

System [1]:

Miscellaneous system functors.

Array [10]:

Array functors: functors operating on arrays.

Wrapper [2]:

Wrappers: functors, evaluating argument(s) in modified environment.

Mutable [7]:

Mutable functors (normally supplying mutable result).

Hash [12]:

Hash functors: functors operating on hashes.

Unary [43]:

Unary functors: functors expecting one argument.

Term [3]:

Term functors: functors operating on terms.

Encoder [3]:

Encoding functors (converters of arbitrary data to strings).

Func [7]:

Binary [34]:

Binary functors: functors expecting two arguments.

Conditional [11]:

Functors, providing conditional evaluation.

Ternary [4]:

Ternary functors: functors expecting three arguments.

Unary [1]:

Mutator [13]:

Mutators: functors, changing values of mutable data.

Predicate [15]:

Predicates: functors, evaluating to boolean.