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Common Lisp/Reference/car
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car, along with cdr, is one of the basic building blocks of Common Lisp which are used to build cons cells.
The car operator, when applied to a list, returns the first element of that list. For example:
(car (list 1 2 3 4 5))
1
It can be replaced by first function Accessor FIRST at CLHS :
(first (list 1 2 3 4 5))
1
References
See also
cons
cdr
list
cadr
car