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Finish up episode 7

ep7
Sameer Rahmani 3 weeks ago
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      docs/videos.org

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docs/videos.org

@ -310,7 +310,8 @@ digraph { @@ -310,7 +310,8 @@ digraph {
(cdr x9)
#+END_SRC
* Episode 6 - Property & Association Lists
* DONE Episode 6 - Property & Association Lists
CLOSED: [2022-06-13 Mon 10:38]
** I have an idea
- Develop *FG42* on stream
- I'll announce the date and time on:
@ -413,3 +414,78 @@ digraph { @@ -413,3 +414,78 @@ digraph {
- https://www.gnu.org/software/emacs/manual/html_node/elisp/Association-Lists.html
- https://www.gnu.org/software/emacs/manual/html_node/elisp/Plist-Access.html
- https://www.gnu.org/software/emacs/manual/html_node/elisp/Plists-and-Alists.html
* Episode 7 - Basic Loops
** About previous episode
- Duplicate keys in an association list
- ~eval-defun~
** While
- Form:
#+BEGIN_SRC emacs-lisp
(while CONDITION
...body...)
#+END_SRC
- Loops and evaluates ~body~ as long as the ~CONDITION~ evaluates to true.
- It always evaluats to the value of the ~CONDITION~ which will be false aaaaall the time.
- We need to explicitly manage the condition.
- Example:
#+BEGIN_SRC emacs-lisp
(let ((foo 1))
(while (< foo 10)
(message ">> %s" foo)
(setq foo (+ 1 foo))))
(let ((foo '(bar baz)))
(while foo
(message ">> %s" (car foo))
(setq foo (cdr foo))))
#+END_SRC
** dolist
- It's a macro
- Form:
#+BEGIN_SRC emacs-lisp
(dolist (element list [result])
...body...)
#+END_SRC
- Evaluates the ~body~ with ~element~ set to the CAR of ~list~ on each iteration
- At the ends evaluates ~result~ and return the evaluation result (if ~result~ is provided)
- Example:
#+BEGIN_SRC emacs-lisp
(let ((foo '(9 8 7 6 5 4)))
(dolist (x foo (+ 10 1))
(message ">> %s" x)))
(let ((foo '(9 8 7 6 5 4)))
(macroexpand-1
'(dolist (x foo 10)
(message ">> %s" x))))
#+END_SRC
** dotimes
- It's a macro too
- Form:
#+BEGIN_SRC emacs-lisp
(dotimes (var number)
...body...)
#+END_SRC
- It's similar to ~dolist~ but iterates ~number~ of times
- ~var~ in will contains the number of current iteration
- Example:
#+BEGIN_SRC emacs-lisp
(let ((foo 10))
(dotimes (x foo)
(message ">> %s" x)))
(let ((foo 10))
(macroexpand-1
'(dotimes (x foo)
(message ">> %s" x))))
#+END_SRC
* Episode 8 - More Loops
** Recursion
** Functional style loops

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