chickadee » sxpath » node-pos

Returns a procedure that, given a nodelist, returns a new nodelist containing only the nth element, counting from 1. If n is negative, it returns a nodelist with the nth element counting from the right. If no such node exists, returns the empty list. n may not equal zero.

Examples:

((node-pos 1) '((div "hi") (span "hello") (em "really, hi!")))
 => ((div "hi"))

((node-pos 6) '((div "hi") (span "hello") (em "really, hi!")))
 => ()

((node-pos -1) '((div "hi") (span "hello") (em "is this thing on?")))
 => ((em "is this thing on?"))