Kofi Sarfo iksarfo

Shallow

Real unit test (isolation, no children render)

Simple shallow

Calls:

constructor
render

I've been deceiving you all. I had you believe that Svelte was a UI framework — unlike React and Vue etc, because it shifts work out of the client and into the compiler, but a framework nonetheless.

But that's not exactly accurate. In my defense, I didn't realise it myself until very recently. But with Svelte 3 around the corner, it's time to come clean about what Svelte really is.

Svelte is a language.

Specifically, Svelte is an attempt to answer a question that many people have asked, and a few have answered: what would it look like if we had a language for describing reactive user interfaces?

A few projects that have answered this question:

	//inspired by http://stackoverflow.com/a/2812306/637783

	type NullCoalesce =
	static member Coalesce(a: 'a option, b: 'a Lazy) = match a with Some a -> a \| _ -> b.Value
	static member Coalesce(a: 'a Nullable, b: 'a Lazy) = if a.HasValue then a.Value else b.Value
	static member Coalesce(a: 'a when 'a:null, b: 'a Lazy) = match a with null -> b.Value \| _ -> a

	let inline nullCoalesceHelper< ^t, ^a, ^b, ^c when (^t or ^a) : (static member Coalesce : ^a * ^b -> ^c)> a b =
	((^t or ^a) : (static member Coalesce : ^a * ^b -> ^c) (a, b))