On 2014/01/16, at 17:40, Jason Orendorff <[email protected]> wrote:
> At the risk of putting too many nails in the board... > > The rationale seems to propose that (0).clz() === 32, but the > hypothetical uint64(0).clz() would return 64. That seems like a bad > idea though. It's weird for two zero values to get such different > behavior from the same method. It's weird for floating-point numbers > to have a clz() method in the first place. > > Since these are two different mathematical functions, they should have > different names: Math.clz32(zero) would be 32 no matter what type of > zero you pass it; the hypothetical Math.clz64(zero) would of course be > 64. That way users can focus on the mathematical function being > computed, rather than runtime types. > > Or maybe: flip the function around so that it returns the number of > bits in the binary expansion of the value: Math.bitlen(15) === 4. This > is just (32 - CLZ), so it effectively computes the same thing as clz. > The advantage is that it extends naturally to integers of any size. What is Math.bitlen(-1) then? Isn’t this just the same problem as before, except it happens for negative numbers instead of positive? _______________________________________________ es-discuss mailing list [email protected] https://mail.mozilla.org/listinfo/es-discuss
