What does this text mean, in node
Simple Lambda Expression Example of the Emacs Lisp manual:
As these examples show, you can use a form with a lambda expression as its car to make local variables and give them values. In the old days of Lisp, this technique was the only way to bind and initialize local variables. But nowadays, it is clearer to use the special form
letfor this purpose
The use of
let is clear to me, but what does car have to do with this?