(lispref.info)Programming Types

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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 are provided 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.
* Sequence Type
Both lists and arrays are classified as sequences.
* List Type
Lists gave Lisp its name (not to mention reputation).
* Array Type
Arrays include strings and vectors.
* String Type
An (efficient) array of characters.
* Vector Type
One-dimensional arrays.
* Symbol Type
A multi-use object that refers to a function, variable, property list, or itself.
* Lisp Function Type
A piece of executable code you can call from elsewhere.
* Lisp 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.

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