(atom item)

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

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(atoms-family format [symbol1 symbol2 ...])

(listp item)

(numberp item)

(type item)

LISP Compatibility

Programming Overview of LISP (LISt Processing) Language