Basically, you need two ports to call out to an external method - one for 
you to pass out the arguments, and one for you to get the return value 
back. The JavaScript interop section 
<> of the guide 
demonstrates how to do this :)

On Thursday, October 13, 2016 at 10:00:47 AM UTC+1, António Ramos wrote:
> hello i know that i have to use ports to pass data from elm to javascript 
> but if i want to call an external  library method inside my elm is there a 
> way to do it?
> As i load my exeternal js file before my compiled elm in my index.html 
> file there should be a way right?
> regards
> António

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