Updated FAQ
in [JavaScript]
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From: Asen Bozhilov on 4 Jan 2010 02:36 Garrett Smith wrote: > Right, I see that now. Weird! It seems that with Host object in IE, the > + operator behaves differently. Yes, but addition operator have different behavior not only with host objects. See below with native object: var o = {toString : null, valueOf : null}; try { window.alert(String(o)); }catch(e) { window.alert(e instanceof TypeError); //[[DefaultValue]] throw TypeError } window.alert('' + o); //empty primitive string value window.alert(o + ''); //[object] They have much more complex algorithm, from presented in ECMA262-3 documentation. And they, definitely doesn't follow specification in that point.
From: Asen Bozhilov on 4 Jan 2010 03:16 Thomas 'PointedEars' Lahn wrote: > Yet another bug triggered by unwise programming. No. That is yet another bug from Microsoft ECMA-262 implementation, called with name JScript. In normal case: new ActiveXObject('Microsoft.XMLHTTP') + ''; //expected TypeError And nobody suggest to do it that. > No. There is also no need of or advantage in relying on implicit > typecasting. | ECMA 5 15.5.4.20 | NOTE The trim function is intentionally generic; | it does not require that its this value be a | String object. | Therefore, it can be transferred | to other kinds of objects for use as a method.
From: Asen Bozhilov on 4 Jan 2010 13:18 Thomas 'PointedEars' Lahn wrote: > Neither writing nor reading appear to be the forté of the current FAQ > maintainer -- goodnight, cljs. So what? I told you before. If you have any problem in real life, go outside and take a fresh air, before start blaming everyone in c.l.js.
From: Dr J R Stockton on 5 Jan 2010 15:54 In comp.lang.javascript message <hhro9k$mn9$1(a)news.eternal- september.org>, Sun, 3 Jan 2010 19:45:50, Garrett Smith <dhtmlkitchen(a)gmail.com> posted: >> >> The Contributors section in the Notes is years out of date. >Certainly is. Anyone want to propose a draft? I shall be reasonably content with anything that does not include my name. -- (c) John Stockton, Surrey, UK. ?@merlyn.demon.co.uk Turnpike v6.05 MIME. Web <URL:http://www.merlyn.demon.co.uk/> - FAQish topics, acronyms, & links. Proper <= 4-line sig. separator as above, a line exactly "-- " (RFCs 5536/7) Do not Mail News to me. Before a reply, quote with ">" or "> " (RFCs 5536/7)
From: Garrett Smith on 5 Jan 2010 22:55
JR wrote: > On Jan 4, 5:14 am, Garrett Smith <dhtmlkitc...(a)gmail.com> wrote: >> Asen Bozhilov wrote: >>> Garrett Smith wrote: >>>> How do I trim whitespace? >>>> Change code to coerce the thisArg to String, as per ES5 [...] >> Look OK? > > It looks completely odd to me. If you test for String.prototype.trim, > then there's no sense in coercing the argument to string, as in (this > + '') or ('' + this), because the trim method should only be used with > strings. The trim() method proposed in the FAQ looks like a mutant, > and I doubt that the FF native code does such a coercion. > You should check those doubts against the specification. Asen was correct in bringing this up and in the workaround for the JScript bug he mentioned. -- Garrett comp.lang.javascript FAQ: http://jibbering.com/faq/ |