Cons

Also known as cons cell

In computer programming, '''' ( or ) is a fundamental function in most dialects of the Lisp programming language. constructs memory objects which hold two values or pointers to two values. These objects are referred to as (cons) cells, conses, non-atomic s-expressions ("NATSes"), or (cons) pairs. In Lisp jargon, the expression "to cons x onto y" means to construct a new object with (cons x y). The resulting pair has a left half, referred to as the (the first element, or contents of the address part of register), and a right half, referred to as the (the second element, or contents of the decre