3.4 Lambda Lists   3.4.4 Macro Lambda Lists   3.4.4.1 Destructuring by Lambda Lists   3.4.4.1.1 Data-directed Destructuring by Lambda Lists

3.4.4.1.1.1 Examples of Data-directed Destructuring by Lambda Lists

(a b c)

which destructures a list of three elements. The variable a is assigned to the first element, b to the second, etc. A more complex example is

((first . rest) . more)

The important features of data-directed destructuring are its syntactic simplicity and the ability to extend it to lambda-list-directed destructuring.