qq

qq

The quasiquote operator behaves like quote, but allows for the insertion of values. It is, in essence, a data structure template. Items within a qq are quoted unless unquoted with unq or unqs (unquote-splicing). unq splices a value into a list unchanged; unqs splices in the values of a list.

(def x "In Our Angelhood")
(def y '(foo bar baz))
(qq (x y (unq x) (unq y) (unqs y)))
    -> (x y "In Our Angelhood" (foo bar baz) foo bar baz)

The percent (%), dollar ($), and at-sign (@) are syntactic sugar for qq, unq,and unqs, respectively. The template above can be written more tersely as:

%(x y $x $y @y)
    -> (x y "In Our Angelhood" (foo bar baz) foo bar baz)