Am Mittwoch, 4. Mai 2016 21:24:08 UTC+2 schrieb Ben Kovitz: > > On May 4, 2016, at 2:32 PM, Johannes <bra...@nordakademie.de <javascript:>> > wrote: > > > Is there any explanation for this behavior? > > My understanding is that you can't eval function objects. Whatever you > give to eval needs to be code that you could enter into the REPL. You > couldn't type #function[user/fn--13335/f--13336] into the REPL and have it > evaluate to that function. More to the point, the reader doesn't handle the > function object represented by that string. For the same reason, you can't > put function objects directly into code generated by macros. > > That said, I've inadvertently given a function object to eval a few times, > and *sometimes* it worked. I don't have an explanation for that. It > actually caused me some confusion, because, since it worked the first time > I tried it, I concluded with surprise and glee that you *can* eval function > objects. But it's not true, at least not reliably. If you want to > (reliably) make eval return something containing a function object, you > need to give eval an expression containing a symbol or expression that > evaluates to that function object—not the function object itself. > > Maybe you are right. But I've deliberately given function objects to eval often without any problems until I used functions of some special kind. I do not understand why the behavior for the 2 versions of the function f- I've shown is different.
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