On Thu, Sep 27, 2012 at 12:10 PM, Tim Brown <tim.br...@cityc.co.uk> wrote: > What is the difference in correctness between "(= x 0)" vs. "(zero? x)"?
There is none: http://docs.racket-lang.org/reference/number-types.html?q=zero%3F#%28def._%28%28quote._~23~25kernel%29._zero~3f%29%29 > And given a choice of (eq? 0 x), (= 0 x) and (zero? x), which > would, and which should take the shortest time to perform 10^12 times? (= 0 x) and (zero? x) should compile to the same code. (eq? 0 x) produces simpler code, because: (= 0 0.0) => #t, but (eq? 0 0.0) => #f. For actual performance numbers, as opposed to reasoning from instructions sequences, Robby's advice about benchmarking is very wise. -- sam th sa...@ccs.neu.edu ____________________ Racket Users list: http://lists.racket-lang.org/users
