Determine whether or not an item is an atom.
Generally, an atom is considered a number or a variable. More specifically, it is anything other than a list. The atom function tests item to see if it is an atom. If item is a list, a nil is returned. If it is not a list, a T is returned.
Examples
| Code | Returns |
|---|---|
| (atom '(1 2 3)) | nil |
| (atom 5) | T |
| (atom '5) | T |
Tell me about...
(atoms-family format [symbol1 symbol2 ...])
Programming Overview of LISP (LISt Processing) Language
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