misc/167317: NzZBvSSXtYQG

tuSVYNkoKaQai info at auszeit-koeln.de
Thu Apr 26 09:20:07 UTC 2012


>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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