Data binding equality in Polymer 1.0

[Steven Bennetts]

In Polymer .5, it was pretty convenient to write:

<div hidden$="{{someSelector != 'foo'}}">

Is there a general way to do this in Polymer 1.0 other than include something like:

<div hidden$="[[equals_(someSelector, 'foo']]">

equals_: function(a, b) { return a == b; }

in every Polymer element that needs this?

[Arthur Evans]

I think this has been mentioned before, but if you want to reuse a set of computing functions in multiple elements, you can put them in a behavior.

Here's a demo:

http://plnkr.co/edit/zvLK3HDtX3DBBU5BXTF9?p=preview

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