(thing) by neil Thu Jun 15 2000 at 23:41:51

Backquote (`) is special syntax in Common Lisp, Scheme, and many other Lisp dialects. It is similar to quote (which returns its argument unevaluated), except it permits parts of the form to be evaluated by prefixing them with comma (,) or comma-splice
(@,). Some examples:

  • `(a b (+ 1 2)) => (a b (+ 1 2))
  • `(a b ,(+ 1 2)) => (a b 3)
  • `(a b ,(list 1 2 3)) => (a b (1 2 3))
  • `(a b ,@(list 1 2 3)) => (a b 1 2 3)

Backquote is very useful in writing macros.

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