js performance question

[Jean-Baptiste BRIAUD -- Novlog]

Hi the list !

What would you recommend me to choose between :
1.
anInstance.index1 = ...
anInstance.index2 = ...

2.
anInstance["index1"] = ...
anInstance["index2"] = ...

On both I can iterates on indexes, I can have direct access to any  
value given a key.
There is no conceptual things here, just various object to store at  
some keys.
It doesn't matter that 1. is class's attributes and 2. array's value.

So I guess the last thing to decide is performance : witch one is  
better ?

Thanks !


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[Fabian Jakobs]

Jean-Baptiste BRIAUD -- Novlog schrieb:

> Hi the list !
>
> What would you recommend me to choose between :
> 1.
> anInstance.index1 = ...
> anInstance.index2 = ...
>
> 2.
> anInstance["index1"] = ...
> anInstance["index2"] = ...
>
> On both I can iterates on indexes, I can have direct access to any  
> value given a key.
> There is no conceptual things here, just various object to store at  
> some keys.
> It doesn't matter that 1. is class's attributes and 2. array's value.
>
> So I guess the last thing to decide is performance : witch one is  
> better ?
>
> Thanks !
>
>  

The first one is faster because the JS engine does not have to create a
string instance and does not have to do a string compare.

Fabian

--
Fabian Jakobs
JavaScript Framework Developer

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