Re: Understanding (some) Lisp

[Teemu Likonen <tlikonen@xxxxxx>]

rhkramer@xxxxxxxxx [2019-03-28 12:00:44-04] wrote:

> I think I got the gist of most of it, but I don't understand why the
> double parenthesis around "((inhibit-read-only t))"?

"let" is a special operator which creates new variable bindings. The
syntax is like this:

    (let list-of-variable-bindings
      code-forms)

And each bindings is in the form of (variable value):

    (let ((variable1 value1)
          (variable2 value2)
          (variable3 value3)
          ;; ...
          (variable-n value-n))
      ;; Code that may use those variable bindings.
      )

So logically if there is only one variable binding it looks like this:

    (let ((variable value))
      ;; code
      )

Here's a link to Common Lisp specification about LET and LET* special
operator. Emacs Lisp is different Lisp dialect but it's often quite
close to Common Lisp.

http://www.lispworks.com/documentation/HyperSpec/Body/s_let_l.htm

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