On Sun, 23 Oct 2016 at 20:59 Toni <[email protected]> wrote:
> 1. By default, properties of Polymer objects are shared across all
> instances of the object (or, to be more precise, all references to the
> object, since Polymer doesn't create new instances, as in "new Element()").
> Basically, all properties are by default static.
>
This is not quite accurate.
> 2. Every property that is supposed to be individual to the specific
> reference, in other words, be not static, and changable without messing
> with any other instance/reference, has to have the field "value: function()
> { return []; }".
>
This is only required for Arrays and Objects.
Explanation:
In Javascript all variables are passed-by-value. The variable "holding" an
Object doesn't actually hold the Object; it only holds a reference to the
Object in memory. Whereas a variable pertaining to a primitive type
actually holds the value rather than a reference to the value in memory.
When Polymer creates a new instance of your element it copies the prototype
into a new Object. When the variable is copied the value is copied and
passed-by-value but as the value is actually a reference to the original
Object then the new instance will use the same object as all other
instances.
This is a problem with Javascript in general and not specific to Polymer.
Dan.
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