Requests for enlightenment:
On Sun, Feb 12, 2012 at 7:42 PM, Shimon Doodkin <[email protected]>wrote:
> for (var key in myobj) must be accompanied with
> if(Object.hasOwnProperty.call(myobj,key))
>
> example:
>
> for (var key in myobject) {
> if(Object.hasOwnProperty.call(myobject,key)){
> ...
> }
> }
>
> myobject.forEach(function(){...}) already does this.
>
>
> more:
>
> You could do : myobj.hasOwnProperty(key) But then if myobj is NULL it
> will throw an error.
>
Wouldn't it be more efficient to simply check if myobj is null before
trying to iterate over it?
In similar vein, wouldn't it be better to not declare the var inside the
for() in this instance?
I realize that for the vast majority of cases the contents of the loop will
be far heavier than the scaffolding involved, but since we are presenting
'best practice' scenarios for something that I would imagine would often
sit in a util function somewhere...
I have created: http://jsperf.com/obj-property-iteration in case it might
have value, if nothing else to have a place to tack on various approaches.
So you use the method hasOwnProperty from the prototype object.
> and you call it with changing the this object of it to your object.
>
> Object.hasOwnProperty.call(myobj,key)
>
> Most of you probably know this, but sometimes I encounter modules that
> don't do this.
> And they do unexpected errors.
>
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