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Re: Help with Hold


If I understood your question correctly
here is another solution:

expr = Hold[x, Null, y, Null, Null]
ls = List @@ (ToString /@ Unevaluated /@ expr) /. "Null" -> Null
ls // InputForm

2009/6/18 Erich Neuwirth <erich.neuwirth at>:
> How can I transform
> Hold[x,Null,y,Null,Null]
> into
> {"x",Null,"y",Null,Null}
> even if x and/or y have assigned values?

Yuri Kandrashkin

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