Are you using the last version of iron-list (v1.0.1)?  Here's your code 
using the last version: http://jsbin.com/facani/edit?html,output

bower update or 
https://github.com/PolymerElements/iron-list/releases/tag/v1.0.1


On Friday, July 24, 2015 at 9:16:32 AM UTC-7, Kujako wrote:
>
> I'm trying to setup an iron-list using a local array for its data source.
>
> <dom-module id=“my-list">
>   <template> 
>     <iron-list items="{{myItems}}" as="item" indexAs="myIndex"> 
>       <template> 
>         <div class="item">{{item.name}}</div> 
>       </template> 
>     </iron-list> 
>   </template> 
>   <script> 
>     Polymer({ 
>       is:’my-list', 
>       properties: { 
>         myItems: { 
>         type: Array, 
>         notify: true 
>         } 
>       }, 
>       addItem: function(item) { 
>         this.push("myItems", JSON.parse('{"name":"'+item+'"}')); 
>       }, 
>       ready: function() { 
>         this.myItems=[ 
>         {'name':'Taco'}, 
>         {'name':'Burger'}, 
>         {'name':'Fries'}, 
>         {'name':'Chips'} 
>         ]; 
>       } 
>     }); 
>   </script> 
> </dom-module>
>
>
> Everything works, but from the ready() method I get "Uncaught RangeError: 
> Invalid array length". This seems to happen whenever the array is set for 
> the first time. While this does not impact operations from a browser, 
> Cordova stops on this error.
>
>
> Any ideas as to how to suppress or prevent this error? Kind of running 
> blind as I can't find any example code to work off of.
>
>
>

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