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Article contents:== Friendly CHICKEN If you're a CHICKEN beginner, you come from another language or a different scheme implementation, there are a few things you might be wondering about, when you're first exposed to CHICKEN. This little tutorial shall help you to lower the barriers and highlight some little pitfalls so that your time with CHICKEN is more fun from the very beginning. For a general introduction to CHICKEN, see [[man/5/Getting started|Getting started]]. === UTF-8 CHICKEN's string procedures generally operate on byte-strings. That means they are not aware of encodings such as UTF-8. The following csi transcript shows this: <enscript highlight="bash"> CHICKEN (c) 2008-2020, The CHICKEN Team (c) 2000-2007, Felix L. Winkelmann Version 5.2.0 (rev 317468e4) linux-unix-gnu-x86-64 [ 64bit dload ptables ] Type ,? for help. #;1> (string-length "λ") 2 #;2> </enscript> As you see {{string-length}} on the string containing the unicode-character returns 2 rather than 1. To fix this you need to install and use [[/egg/utf8|the utf8 egg]] ({{chicken-install utf8}}). See the transcript with {{utf8}} loaded: <enscript highlight="bash"> CHICKEN (c) 2008-2020, The CHICKEN Team (c) 2000-2007, Felix L. Winkelmann Version 5.2.0 (rev 317468e4) linux-unix-gnu-x86-64 [ 64bit dload ptables ] Type ,? for help. #;1> (import utf8) ; loading /home/mario/local/chicken-5.2.0/lib/chicken/11/utf8.import.so ... Note: re-importing already imported identifier: string-length Note: re-importing already imported identifier: string-ref Note: re-importing already imported identifier: string-set! Note: re-importing already imported identifier: make-string Note: re-importing already imported identifier: string Note: re-importing already imported identifier: substring Note: re-importing already imported identifier: string->list Note: re-importing already imported identifier: list->string Note: re-importing already imported identifier: string-fill! Note: re-importing already imported identifier: write-char Note: re-importing already imported identifier: read-char Note: re-importing already imported identifier: display Note: re-importing already imported identifier: print Note: re-importing already imported identifier: print* ; loading /home/mario/local/chicken-5.2.0/lib/chicken/11/utf8.so ... ; loading /home/mario/local/chicken-5.2.0/lib/chicken/11/regex.so ... ; loading /home/mario/local/chicken-5.2.0/lib/chicken/11/utf8-lolevel.so ... #;2> (string-length "λ") 1 </enscript> Nevermind the notes -- they are just an indication that procedures from the {{utf8}} egg are redefining the procedures from the {{scheme}} module. === Load useful libraries and units in csi automatically If you find yourself using these libraries alot you might want to have {{csi}} load them whenever you start it up. This can easily be done by adding them to your {{$HOME/.csirc}}. A sample {{.csirc}} might look like this: <enscript highlight="scheme"> (import utf8 srfi-1 srfi-13) </enscript> Note that you have to install {{utf8}}, {{srfi-1}} and {{srfi-13}} via {{chicken-install}}. === Other useful eggs and units for real world tasks There are some other units and eggs that you might find helpful to solve real world problems with CHICKEN. The following lists a few of them: ==== Eggs * [[/egg/utf8|UTF8]] - Make string procedures utf8 aware * [[/egg/srfi-1|SRFI-1]] - List procedures * [[/egg/srfi-13|SRFI-13]] - String procedures * [[/egg/srfi-69|SRFI-69]] - Hashtables ==== Units (You don't need to chicken-install these) * [[/manual/Module (chicken irregex)|irregex]] - Regular expressions === Happy Hacking I hope this little guide helps you to start your CHICKEN journey without too many surprises. Have fun hacking ...Description of your changes:

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