---
title: "Olaf (@olaf) | Hashnode"
description: "Olaf (@olaf) writes on Hashnode. Read their latest articles and follow their work."
url: "https://hashnode.com/@olaf"
---

@olaf

# Olaf

@olaf · Joined September 2021

## Comments

[Fantastic, Mia!! I saw this post, reproduced it with ease, and now use it :-) Thank you very much!](https://hashnode.com/posts/how-to-add-history-to-the-repl-config-file/61961d6a90fac127e6ea5f02/comment/6196438d0b25eb28701f5f0a)

Comment · Article · Nov 18, 2021 · [How to Add History to the REPL Config File](https://hashnode.com/posts/how-to-add-history-to-the-repl-config-file/61961d6a90fac127e6ea5f02)

[Hi Mia, is the idx function presented here as a basis for the database blog-posts or is it possible / recommended to use idx by itself to build and lookup sth like a simple key-value store? Regards, Olaf](https://hashnode.com/posts/picolisp-explored-the-idx-function/614c37e9c790e72dddca7994/comment/617e780475401e57d6a89d06)

Comment · Article · Oct 31, 2021 · [PicoLisp Explored: The idx function](https://hashnode.com/posts/picolisp-explored-the-idx-function/614c37e9c790e72dddca7994)

[I never realized, that picolisp <post> has all batteries included to create a minimalistic form by itself. This is why I can't keep my hands off picolisp: put following lines in a file form-app.l on machine with installed picolisp (html 0 "Simple Post" \*Css NIL (<post> NIL \*Url (<label> NIL "set \*Snippet to: ") (<field> 30 '\*Snippet) (<submit> "Send") ) # end <post> # do sth with \*Snippet (ht:Prin "display \*Snippet: " \*Snippet) # ... ) # end <html> then run it from where the file exists with pil @lib/http.l @lib/xhtml.l @lib/form.l --server 8079 form-app.l + and one has immediately a running interactive page on http://localhost:8079 Great! Thanks for your Blog.](https://hashnode.com/posts/web-application-programming-in-picolisp-creating-html-forms-part-1/615d685738ba5c7155d58ee7/comment/61741d2c0f452c1cd94fa23d)

Comment · Article · Oct 23, 2021 · [Web Application Programming in PicoLisp: Creating HTML Forms, Part 1](https://hashnode.com/posts/web-application-programming-in-picolisp-creating-html-forms-part-1/615d685738ba5c7155d58ee7)

[Hi Mia, I do like the list part of this article, I never used yoke before (even did'nt know about it), now I will :-) The 'c\[a|d\]+r' :-) functions in picolisp exist as a tribute for old lisper's, are'nt they? For beginners to (pico)Lisp I would prefer to define (setq first car) # you can call it first-of-list if you want (setq rest-of-list cdr) # rest would overwrite existing picolisp core function For me it was easier to understand and to remember : (first (rest-of-list '(1 2 3 4 5 6)) # same as (cadr '(1 2 3 4 5 6)) -> 2 : (rest-of-list (first '((1 2) 3 4 5 6)) # same as (cdar '((1 2) 3 4 5 6)) -> (2) But for sure, (first (rest-of-list (rest-of-list (rest-of-list '(1 2 3 4 5 6)))) would never ever be used (and therefore never be listed under the 60 most used functions) instead of a simple (cadddr (1 2 3 4 5 6)):-) (By the way, both should return: 4)](https://hashnode.com/posts/60-picolisp-functions-you-should-know-6-lists-and-strings/613b375cd6057d516e7ece96/comment/613c62f51821961e2551e18b)

Comment · Article · Sep 11, 2021 · [60 PicoLisp Functions You Should Know - 6: Lists and Strings](https://hashnode.com/posts/60-picolisp-functions-you-should-know-6-lists-and-strings/613b375cd6057d516e7ece96)

[Thanks for your nice intro in picolisp coding! I would like to point at the fact, that (print (1 "abc" (d e (f)) 999 ghi)) does only work without a single quote (') in front of the list because of a picolisp distinctive feature: a list starting with a number will not evaluate as a function call - or exactly spoken: "if the CAR of the list is a number, the whole list is returned as it is" To print lists not starting with a number, one has to add the single quote in front of the list to escape evaluation of the list as a function call. (print '("abc" (d e (f)) 999 ghi)) (otherwise picolisp will not print the list and respond: "abc" -- undefined ) In my early days with picolisp I got confused by different code examples with lists being quoted sometimes and being not quoted other times - it took a while until I really checked that simple rule above :-)](https://hashnode.com/posts/60-picolisp-functions-you-should-know-3-inputoutput/61372d3bef28811d8bed6b40/comment/6139cd402c9ec22314f4b31a)

Comment · Article · Sep 9, 2021 · [60 PicoLisp Functions You Should Know - 3: Input/Output](https://hashnode.com/posts/60-picolisp-functions-you-should-know-3-inputoutput/61372d3bef28811d8bed6b40)