Maciej Stachowiak wrote: > > On Aug 15, 2008, at 9:17 PM, Michael Haufe wrote: > >> >> -------------------------------------------------------------- >> >> (define (+ x y) >> (if (= x 0) >> y >> (+ (-1+ x) (1+ y)))) >> >> function add(x,y) (!x) ? y : add(--x,++y); >> -------------------------------------------------------------- >> I don't claim to be a Scheme expert, but I believe my interpretation >> to be correct. >> I am also aware of the recursion limits of ES having used it for a >> number of years. >> This is for personal study and amusement. > > I do claim to be a Scheme expert, and I believe your interpretation is > incorrect. The -1+ and 1+ procedures in Scheme return a value derived > by adding either -1 or +1 to their argument, but do not mutate their > argument - a Scheme procedure cannot do so, only a special form could. > However, ECMAScript -- and ++ mutate the referenced location, in > addition to returning a value. Preincrement/predecrement operators > will at least return the modified instead of the original value, > unlike the post versions, but they are still mutators and thus do not > match the Scheme seantics. > > Regards, > Maciej > > >
Then I stand corrected, much appreciated. _______________________________________________ Es-discuss mailing list [email protected] https://mail.mozilla.org/listinfo/es-discuss
