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02:22 noelw: Hi
02:23 noelw: Anyone awake?
02:23 noelw: and knowledgable on syntax certificates?
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02:27 noelw: Slackers, all of you
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07:15 bremner: yup
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22:25 Samy: i call my function with (name param1 param2)  and want that my function only return param1 how i can do that ?
22:26 Samy: (color  yellow blue)  --> return  yellow
22:29 Samy: Or is there a way for returns 1 random item from a list ?  Something like (random list) -> returns random element from a list ?
22:36 jonrafkind: (define (name a b) a)
22:37 jonrafkind: (list-ref (random (length some-list)) some-list)
22:48 Samy: Thx
22:50 Samy: Now another problem. I want random a number (random 2)  and save  it . In a condition i want compare this randomed number with another numbers.
22:51 jonrafkind: (define x (random 2))
22:51 jonrafkind: (if ... (= x y) ...)
22:51 jonrafkind: the real question is why is that not obvious
22:53 Samy: Because  i  think  evrytime i use  X in my code this random new number or not ?
22:53 jonrafkind: what do you mean?
22:53 Samy: (if  x==2) ; random new number  (if x==3) ; random new number ....
22:54 Samy: Ok i try what you said mom ;)
22:54 jonrafkind: variables dont magically change value
22:54 jonrafkind: once you set them they stay that way
22:58 Samy: Ok thx  it works
23:18 Samy: Ok i have (define x (random 2)) now i want x new randomed.  How i can do that ?
23:19 jonrafkind: (set! x (random 2))
23:19 Samy: thx
23:19 jonrafkind: its better if you can use a new variable instead of setting an old variable
23:19 Samy: why ?
23:21 jonrafkind: because when you have a lot of code you will quickly get confused if you use set! a lot
23:21 jonrafkind: you can do it either way for now, but heed my warning for the future
23:23 Samy: How you solve this than. I have a code block what need 1 rnd number.  Sometimes this codeblock must be used 100 times and evrytime this need a new rnd number
23:24 jonrafkind: put the code block into a function and define the random variable in there
23:24 jonrafkind: (define (do-stuff) (define x (random 5)) ....)
23:29 Samy: racket allow define in define ?
23:29 jonrafkind: yes
23:29 Samy: ah ok
23:29 jonrafkind: there are many times when you can write (define ...), sometimes you cant
23:29 jonrafkind: but you can do things like (let ([x 2]) (define q 5) (display q))
23:30 jonrafkind: but you cant do (cond (define x 5) ([= x 5] ...))
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