Editing CAR and CDR (section)

==Other computer languages==
Many languages (particularly [[Functional programming|functional]] languages and languages influenced by the functional [[Programming paradigm|paradigm]]) use a [[Linked list|singly linked list]] as a basic data structure, and provide primitives or functions similar to <code>car</code> and <code>cdr</code>. These are named variously <code>first</code> and <code>rest</code>, <code>head</code> and <code>tail</code>, etc. In Lisp, however, the cons cell is not used only to build linked lists but also to build pair and nested pair structures, i.e. the <code>cdr</code> of a cons cell need not be a list. In this case, most other languages provide different primitives as they typically distinguish pair structures from list structures either typefully or semantically. Particularly in typed languages, lists, pairs, and trees will all have different accessor functions with different type signatures: in [[Haskell (programming language)|Haskell]], for example, <code>car</code> and <code>cdr</code> become <code>fst</code> and <code>snd</code> when dealing with a pair type. Exact analogues of <code>car</code> and <code>cdr</code> are thus rare in other languages. [[Clojure]] uses <code>first</code> instead of <code>car</code> and <code>next</code> or <code>rest</code> instead of <code>cdr</code>.  [[Logo (programming language)|Logo]], on the other hand, uses <code>first</code> instead of <code>car</code> and <code>butfirst</code> instead of <code>cdr</code>.