====== ALisp Data Types ======

[[ALisp:About | ALisp]] has several core data types.

===== Core Datatypes =====


^ Datatype   ^ Description ^ 
| Integers   | Represented as a literal number.  |
| Numbers    | Represented as a literal number.  |
| Symbols    | Represented as any string of characters other than the following:  single-quote, double-quote, left parenthesis, or right parenthesis.  Additionally, symbols must not begin with a pound sign. |
| Pairs      | Represented as a parenthesis-enclosed pair of two items, separated by a dot `.'.  The first item is called the car and the second item is called the cdr. |
| Lists      | Represented as a parenthesis-enclosed list of whitespace-separated objects.  An improper list can be represented the same way as a list, except that it has a dot between its last two items. |
| Strings    | Represented as a double-quote-enclosed string of any characters except for a double-quote. |
| Vectors    | Represented as a proper list preceded immediately by a pound sign. |
| Procedures | |
| Macros     | |
| Closures   | |
| User-defined macros | |
| Special objects | These include the boolean true and false values (`#t' and `#f', respectively), and the end-of-list value (`()'). |


===== Other Datatypes =====

Some other data types are used only internally by the [[ALisp:About | ALisp]] interpreter.

Additional data types are defined by the [[FSpace:About | FrontierSpace engine]].  These are:
  - Components
  - Component settings
  - Component commands
  - Commodities
  - Long range sensor contacts

====== Example Uses of Datatypes ======