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Convert a list of symbols with value as a local variable.

cessej

I have given with a list of symbols with a value. What I want is to be able to call/use the symbol as a variable. What function do I need to convert a given list as a variable? Also these variables are local only to the given user function.

procedure(myFunc()

myList = list( list('varA 1.0) list('varB 2.0) list('varC 4.0))

; what function do I need to convert the given list as a variable?

;; also these variables are local only inside this function.

varC=varA + varB   ;; varC having value of 3.0

println(varA + varB)  ;; expected output is 3.0

 )

Parents
  • The idea is that you list the variables that you're going to use in the body of the code. So if you have varA, varB, varC, varD, varE in myList, but you're only going to use varB and varD in the calculation, you would do:

    abWithRules(myList (varB varD)
    println(varB+varD)
    )

    Presumably the calculation part you know which rules you're referencing and it's not completely free form.

    Otherwise you'd have to use the apply() form that I described earlier.

    One thing I just wondered - were you expecting any assignments to the variables to alter the values in myList at the end? The macro could be changed to do that, but the apply() approach couldn't (without a fair bit of jiggery pokery).

    Regards,

    Andrew
Reply
  • The idea is that you list the variables that you're going to use in the body of the code. So if you have varA, varB, varC, varD, varE in myList, but you're only going to use varB and varD in the calculation, you would do:

    abWithRules(myList (varB varD)
    println(varB+varD)
    )

    Presumably the calculation part you know which rules you're referencing and it's not completely free form.

    Otherwise you'd have to use the apply() form that I described earlier.

    One thing I just wondered - were you expecting any assignments to the variables to alter the values in myList at the end? The macro could be changed to do that, but the apply() approach couldn't (without a fair bit of jiggery pokery).

    Regards,

    Andrew
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