Date: Thu, 26 Apr 2012 09:16:52 GMT From: tuSVYNkoKaQai <info@auszeit-koeln.de> To: freebsd-gnats-submit@FreeBSD.org Subject: misc/167317: NzZBvSSXtYQG Message-ID: <201204260916.q3Q9Gq16087904@red.freebsd.org> Resent-Message-ID: <201204260920.q3Q9K6WT066278@freefall.freebsd.org>
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>Number: 167317
>Category: misc
>Synopsis: NzZBvSSXtYQG
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: change-request
>Submitter-Id: current-users
>Arrival-Date: Thu Apr 26 09:20:06 UTC 2012
>Closed-Date:
>Last-Modified:
>Originator: tuSVYNkoKaQai
>Release: rRwjtEXSGTGihCKct
>Organization:
qZYbnPNhgFSXcnEXe
>Environment:
Re: Issue: #181There is a pseudo-workaround for this bug.While you caonnt do direct inheritance, you can "clone" the Array prototype and get a mostly functional length property.Code:// create your class MyArray = function(){// instantiates the "length" property so that it is non-enumerable this.push.apply(this,[]); // set the length property to 0, otherwise it is effectively undefined this.length=0; return this; }; // create an explicit list of Array prototype properties to "steal" as you caonnt use for/in loop to retrieve var p=['push','concat'];// manually copy the properties from the Array prototype to MyArray prototype for(var x=0; x<p.length; x++){ MyArray.prototype[p[x]]=Array.prototype[p[x]]; } var a=new MyArray(); a.push(1); alert(a.length);// 1// this fails, length property is only updated using the Array native functions a[1]=2; alert(a.length);// 1end codeWhile this has some obvious drawbacks,it does get you a pseudo-subclass that works across all b
rowsers.
>Description:
Re: Issue: #181There is a pseudo-workaround for this bug.While you caonnt do direct inheritance, you can "clone" the Array prototype and get a mostly functional length property.Code:// create your class MyArray = function(){// instantiates the "length" property so that it is non-enumerable this.push.apply(this,[]); // set the length property to 0, otherwise it is effectively undefined this.length=0; return this; }; // create an explicit list of Array prototype properties to "steal" as you caonnt use for/in loop to retrieve var p=['push','concat'];// manually copy the properties from the Array prototype to MyArray prototype for(var x=0; x<p.length; x++){ MyArray.prototype[p[x]]=Array.prototype[p[x]]; } var a=new MyArray(); a.push(1); alert(a.length);// 1// this fails, length property is only updated using the Array native functions a[1]=2; alert(a.length);// 1end codeWhile this has some obvious drawbacks,it does get you a pseudo-subclass that works across all browsers.
>How-To-Repeat:
Re: Issue: #181There is a pseudo-workaround for this bug.While you caonnt do direct inheritance, you can "clone" the Array prototype and get a mostly functional length property.Code:// create your class MyArray = function(){// instantiates the "length" property so that it is non-enumerable this.push.apply(this,[]); // set the length property to 0, otherwise it is effectively undefined this.length=0; return this; }; // create an explicit list of Array prototype properties to "steal" as you caonnt use for/in loop to retrieve var p=['push','concat'];// manually copy the properties from the Array prototype to MyArray prototype for(var x=0; x<p.length; x++){ MyArray.prototype[p[x]]=Array.prototype[p[x]]; } var a=new MyArray(); a.push(1); alert(a.length);// 1// this fails, length property is only updated using the Array native functions a[1]=2; alert(a.length);// 1end codeWhile this has some obvious drawbacks,it does get you a pseudo-subclass that works across all browsers.
>Fix:
Re: Issue: #181There is a pseudo-workaround for this bug.While you caonnt do direct inheritance, you can "clone" the Array prototype and get a mostly functional length property.Code:// create your class MyArray = function(){// instantiates the "length" property so that it is non-enumerable this.push.apply(this,[]); // set the length property to 0, otherwise it is effectively undefined this.length=0; return this; }; // create an explicit list of Array prototype properties to "steal" as you caonnt use for/in loop to retrieve var p=['push','concat'];// manually copy the properties from the Array prototype to MyArray prototype for(var x=0; x<p.length; x++){ MyArray.prototype[p[x]]=Array.prototype[p[x]]; } var a=new MyArray(); a.push(1); alert(a.length);// 1// this fails, length property is only updated using the Array native functions a[1]=2; alert(a.length);// 1end codeWhile this has some obvious drawbacks,it does get you a pseudo-subclass that works across all browsers.
>Release-Note:
>Audit-Trail:
>Unformatted:
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