On Jun 15, 2011, at 4:43 PM, Mark S. Miller wrote:
>
>
> On Wed, Jun 15, 2011 at 4:42 PM, Axel Rauschmayer <[email protected]> wrote:
> Ah, very clever. It’d be nice to have an example of using this to compile
> templates (like jQuery templates). Maybe not even the implementation, just a
> quasi literal and why it works.
>
> var myTmpl = tmpl`Dear ${{first}} ${{last}}`; // (*)
> alert(myTempl.render({ first: "Jane", last: "Doe" }));
>
> The handler (at (*)) is called like this:
> tmpl(callSiteId73654, { first: undefined }, { last: undefined });
>
> BTW: won’t it be a problem (for this use case) if the variables first and
> last don’t exist?
>
> It would indeed be a problem. How much does this matter?
In ES.next unresolved resolved references to lexical bindings are early errors.
{first} is equivalent to {first: first} so the RHS reference to first is a
lexically bound unresolved reference that would produce an early error before
the code ever ran.
Allen
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