Cons - Use


Although cons cells can be used to hold ordered pairs of simplex data, they are more commonly used to construct more complex compound data structures, notably lists and binary trees.

For example, the Lisp expression (cons 1 2) constructs a cell holding 1 in its left half (the so-called car field) and 2 in its right half (the cdr field). In Lisp notation, the value (cons 1 2) looks like:

(1 . 2)

Note the dot between 1 and 2; this indicates that the S-expression is a "dotted pair," rather than a "list."

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