The curly brackets is representing two way binding, the square ones one way:
https://www.polymer-project.org/1.0/docs/devguide/data-system#data-flow-control
On Wednesday, September 7, 2016 at 10:49:52 AM UTC+2, wilby yang wrote:
>
> I sometimes come across {{}} syntax and sometimes [[]] in the template
> data binding. I am rather sure [[]] usage, which is referring the
> properties in the component. but what does {{}} do?
>
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