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symbol property question

RVERP

I declare 3 variables

a = 10
b= 20
test=list('a 'b)

now I do test->x = 99

now test = (a x 99 b)

 So my list has become 4 items long, containing symbols a,b and x, and a value 99
x is still unbound.

 what has happened when i did test->x = 99??

 

Parents

  • There is absolutely no problem with having a disembodied property list with something other than nil as the first element - in fact I have used this to allow me to store something useful in that place - to allow me to have assoc lists of dpls.

    The DPL will work fine - you can use test->x to retrieve the value. The fact that there is a strange dummy value at the end wouldn't be a problem. Not sensible, but not a problem either.

    Andrew.

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  • There is absolutely no problem with having a disembodied property list with something other than nil as the first element - in fact I have used this to allow me to store something useful in that place - to allow me to have assoc lists of dpls.

    The DPL will work fine - you can use test->x to retrieve the value. The fact that there is a strange dummy value at the end wouldn't be a problem. Not sensible, but not a problem either.

    Andrew.

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