Math ugliness.
in [JavaScript]
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From: Jorge on 17 Feb 2010 16:11 On Feb 17, 10:08 pm, Jorge <jo...(a)jorgechamorro.com> wrote: > On Feb 17, 9:24 pm, Peter Michaux <petermich...(a)gmail.com> wrote: > (...) > I thought it was licit for an object's method to operate on the > object. s/licit/legitimate/ -- Jorge.
From: Lasse Reichstein Nielsen on 17 Feb 2010 16:34 Jorge <jorge(a)jorgechamorro.com> writes: > On Feb 17, 9:21�pm, Thomas 'PointedEars' Lahn <PointedE...(a)web.de> > wrote: >> >> Yes, there is: Repeated accesses to properties of `this' would not need >> repeated conversion to object, whether inside the method context or outside >> (if `this' was returned and the return value re-used). > > But these are just the specs. Implementations can optimize. > IOW: "you can cheat if you don't get caught" Indeed, it's quite possible to look up a property of Number.prototype without creating a new Number object. /L -- Lasse Reichstein Holst Nielsen 'Javascript frameworks is a disruptive technology'
From: Jorge on 17 Feb 2010 16:45 On Feb 17, 7:05 pm, Jorge <jo...(a)jorgechamorro.com> wrote: > > var x= 3; > Number.prototype.test= function () { return this; }; > x.test() === x.test() > --> false @kangax: isn't this a nice one for the quiz ? -- Jorge.
From: Jorge on 17 Feb 2010 16:46 On Feb 17, 10:34 pm, Lasse Reichstein Nielsen <lrn.unr...(a)gmail.com> wrote: > Jorge <jo...(a)jorgechamorro.com> writes: > > > But these are just the specs. Implementations can optimize. > > IOW: "you can cheat if you don't get caught" > > Indeed, it's quite possible to look up a property of Number.prototype > without creating a new Number object. Absolutely. -- Jorge.
From: Thomas 'PointedEars' Lahn on 17 Feb 2010 17:01
Lasse Reichstein Nielsen wrote: > Jorge writes: >> Thomas 'PointedEars' Lahn wrote: >>> Yes, there is: Repeated accesses to properties of `this' would not need >>> repeated conversion to object, whether inside the method context or >>> outside (if `this' was returned and the return value re-used). >> >> But these are just the specs. Implementations can optimize. >> IOW: "you can cheat if you don't get caught" You would. Conforming implementations can only optimize where the Specification does not forbid it. > Indeed, it's quite possible to look up a property of Number.prototype > without creating a new Number object. Not in a conforming implementation of ECMAScript Edition 5. There is not that much room to maneuver here: | A conforming implementation of ECMAScript must provide and support all | the types, values, objects, properties, functions, and program syntax | and semantics described in this specification. ^^^^^^^^^^^^^ PointedEars -- var bugRiddenCrashPronePieceOfJunk = ( navigator.userAgent.indexOf('MSIE 5') != -1 && navigator.userAgent.indexOf('Mac') != -1 ) // Plone, register_function.js:16 |