Info Catalog
elisp: Comments
elisp: Lisp Data Types
elisp: Editing Types
2.3 Programming Types ===================== There are two general categories of types in Emacs Lisp: those having to do with Lisp programming, and those having to do with editing. The former exist in many Lisp implementations, in one form or another. The latter are unique to Emacs Lisp.
· Integer Type Numbers without fractional parts.
· Floating-Point Type Numbers with fractional parts and with a large range.
· Character Type The representation of letters, numbers and
control characters.
· Symbol Type A multi-use object that refers to a function,
variable, or property list, and has a unique identity.
· Sequence Type Both lists and arrays are classified as sequences.
· Cons Cell Type Cons cells, and lists (which are made from cons cells).
· Array Type Arrays include strings and vectors.
· String Type An (efficient) array of characters.
· Vector Type One-dimensional arrays.
· Char-Table Type One-dimensional sparse arrays indexed by characters.
· Bool-Vector Type One-dimensional arrays of ‘t’ or ‘nil’.
· Hash Table Type Super-fast lookup tables.
· Function Type A piece of executable code you can call from elsewhere.
· Macro Type A method of expanding an expression into another
expression, more fundamental but less pretty.
· Primitive Function Type A function written in C, callable from Lisp.
· Byte-Code Type A function written in Lisp, then compiled.
· Autoload Type A type used for automatically loading seldom-used
functions.
· Finalizer Type Runs code when no longer reachable.