On Aug 25, 2008, at 5:25 PM, Waldemar Horwat wrote: > Brendan Eich wrote: >>> - Should decimal values behave as objects (pure library >>> implementation) or as primitives? >>> >>> If they behave as objects, then we'd get into situations such as >>> 3m != >>> 3m in some cases and 3m == 3m in other cases. Also, -0m != 0m would >>> be necessary. This is clearly unworkable. >> >> What should be the result of (typeof 3m)? > > "decimal". It should not be "object" because it doesn't behave > like other objects!
Clearly, you are correct (but you knew that ;-). Specifically, 1. typeof x == "object" && !x => x == null. 2. typeof x == typeof y => x == y <=> x === y 3. 1.1m != 1.1 && 1.1m !== 1.1 (IEEE P754 mandates that binary floats be convertible to decimal floats and that the result of the conversion of 1.1 to decimal be 1.100000000000000088817841970012523m) Therefore typeof 1.1m != "object" by 1, or else 0m could be mistaken for null by existing code. And typeof 1.1m != "number" by 3, given 2. This leaves no choice but to add "decimal". /be _______________________________________________ Es-discuss mailing list [email protected] https://mail.mozilla.org/listinfo/es-discuss
