On Thursday, February 15, 2018 at 11:01:41 AM UTC+1, Vassilis Virvilis 
wrote:
>
> Amazing trick!
>
> Obvious if you think about it - but very difficult to think it initially 
> (for us mere mortals).
>

Well, when you write "element.getBoundingClientRect" in JS (without the 
parenthesis), this is exactly what you're doing: getting a reference to the 
function.
In JS, if you call it later, you need to either use .call(element) or 
.apply(element) to setup the appropriate 'this' element, or you first need 
to .bind(element) it to the element. I'm not sure how JsInterop works in 
this case, maybe (probably) my second example wouldn't actually work as it 
does neither of these (you could use an element2.core.Function to 
.call()/.apply() or .bind()).

That being said, I didn't came with this pattern by myself either, I 
believe I saw it somewhere in GWT's emulation library.

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