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GNU Info (emacs-lisp-intro.info)insert-buffer bodyThe Body of the `insert-buffer' Function ---------------------------------------- The body of the `insert-buffer' function has two major parts: an `or' expression and a `let' expression. The purpose of the `or' expression is to ensure that the argument `buffer' is bound to a buffer and not just the name of a buffer. The body of the `let' expression contains the code which copies the other buffer into the current buffer. In outline, the two expressions fit into the `insert-buffer' function like this: (defun insert-buffer (buffer) "DOCUMENTATION..." (interactive "*bInsert buffer: ") (or ... ... (let (VARLIST) BODY-OF-`let'... ) To understand how the `or' expression ensures that the argument `buffer' is bound to a buffer and not to the name of a buffer, it is first necessary to understand the `or' function. Before doing this, let me rewrite this part of the function using `if' so that you can see what is done in a manner that will be familiar. |