car is an acronym from the phrase Contents of the Address part of the Register; and cdr is an acronym from the phrase Contents of the Decrement part of the Register. These phrases refer to specific pieces of hardware on the very early computer on which the
What are car and cdr used for?
The car and cdr functions are used for splitting lists and are considered fundamental to Lisp. Since they cannot split or gain access to the parts of an array, an array is considered an atom. Conversely, the other fundamental function, cons , can put together or construct a list, but not an array.
Why is cdr used?
Why are CDRs important? A CDR log lists every billable communications transmission on your phone system. This allows phone companies to generate your phone bills, and lets you keep definite records of how and when your phone system was used. They are primarily used by businesses to assist in call reporting and billing.
