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Document creating JS functions with varargs #557

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15 changes: 15 additions & 0 deletions doc/interoperability/types.md
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Expand Up @@ -273,6 +273,21 @@ var o = new Object();
var x = f.call(o, 4);
{% endhighlight %}

### JS functions with varargs

In order to capture varargs from a JS function, create your own trait that
extends `js.Function` or `js.ThisFunction`.

{% highlight scala %}
trait JsVarargsFn extends js.Function {
def apply(args: Any*): Unit
}

val f: JsVarargsFn = { args =>
println(s"This method was called with ${args.size} args.")
}
{% endhighlight %}

## Dynamically typed interface: `js.Dynamic`

Because JavaScript is dynamically typed, it is not often practical, sometimes
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