Emacs-Lisp

Table of Contents

Syntax

Backquote

Backquote constructs allow you to quote a list, but selectively evaluate elements of that list. In the simplest case, it is identical to the special form quote. For example, these two forms yield identical results: 

`(a list of (+ 2 3) elements)
;; ⇒ (a list of (+ 2 3) elements)

'(a list of (+ 2 3) elements)
;; ⇒ (a list of (+ 2 3) elements)

The special marker ‘,’ inside of the argument to backquote indicates a value that isn’t constant. The Emacs Lisp evaluator evaluates the argument of ‘,’, and puts the value in the list structure: 

`(a list of ,(+ 2 3) elements)
a list of 5 elements

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References