[xul-interop] Why is QueryInterface needed?

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Hi all!

I saw many code examples using QueryInterface, most when it's a very
complicated thing to do. And it's doc says:

The QueryInterface method provides runtime type discovery.

But we use it with javascript, that is dynamically typed language, so why is
it needed?


Best,

*
Wellington B. de Carvalho
*

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Hi all!<div><br></div><div>I saw many code examples using=A0<meta http-equi=
v=3D"content-type" content=3D"text/html; charset=3Dutf-8">QueryInterface, m=
ost when it&#39;s a very complicated thing to do. And it&#39;s doc says:</d=
iv><div>

<br></div><div><meta http-equiv=3D"content-type" content=3D"text/html; char=
set=3Dutf-8"><span class=3D"Apple-style-span" style=3D"font-family: &#39;Lu=
cida Grande&#39;, &#39;Lucida Sans Unicode&#39;, Lucida, Arial, Helvetica, =
sans-serif; font-size: 14px; color: rgb(51, 51, 51); line-height: 18px; ">T=
he QueryInterface method provides runtime type discovery.</span><br clear=
=3D"all">

<div><br></div><div>But we use it with javascript, that is dynamically type=
d language, so why is it needed?</div><meta http-equiv=3D"content-type" con=
tent=3D"text/html; charset=3Dutf-8"><div><br></div><div><br></div><div>Best=
,</div>

<div><br></div><i><div style=3D"text-align:left"><span style=3D"font-style:=
normal"><i>Wellington B. de Carvalho</i></span></div></i><br>
</div>

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