private instance functions and properties

[Max Waterman]

(advised by Mr Dodson to post this question here rather than on G+)

I see[0] how to make private static functions and properties - they're common to all instances of the element - but how to make private instance functions and properties so we can store state outside the prototype?

Any ideas?

Thanks,

Max.

[0] <https://www.polymer-project.org/docs/polymer/polymer.html#static>

[Arthur Evans]

Hi Max,

Yes, the title of the section "Adding private or static variables" is confusing, since it only shows variables that 

are both static AND private.

https://www.polymer-project.org/docs/polymer/polymer.html#static

If you want to store state outside of the prototype, you can add properties on this, as you would with any JavaScript object. A good time to do this is in the created callback. This is discussed in the context of published properties, here:

https://www.polymer-project.org/docs/polymer/polymer.html#default-property-values

This jsbin: 

http://jsbin.com/fitahe/15/edit

Shows a private instance variable, exposed via a (published) getter and setter.

Note that in this example, I'm binding to the published name, foo. If the property wasn't published, I'd need to bind to the private name, foo_. I'm not sure whether data binding is relevant to your use case -- I'm only using it here to demonstrate that each instance has its own foo_ value.

Hope this helps,

Arthur

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