On Mar 8, 2014, at 11:05 AM, Mark S. Miller wrote:
>
>
> [1] A more correct expansion is:
>
> var whatsThis = func(
> Object.freeze({
> raw: Object.freeze(['', ' + ', '\\n = ', '']),
> cooked: Object.freeze(['', ' + ', '\n = ', ''])
> }),
> x,
> y,
> x + y
> );
>
> except that the record is evaluated once per evaluation of the enclosing
> Program (loading of the compilation unit), rather than per evaluation of the
> expression. This allows func to memoize template-string-parsings on the
> identity of the record.
Actually, more like:
var whatsThis = func(
Object.freeze(
Object.defineOwnProperty(['', ' + ', '\n = ', ''],'raw', {value:
Object.freeze(['', ' + ', '\\n = ', ''])}
),
x,
y,
x + y
);
As the "cooked" array itself is now specified as the call site object. See
http://people.mozilla.org/~jorendorff/es6-draft.html#sec-runtime-semantics-runtime-semantics-argumentlistevaluation
I'll add a note about possible future properties. Also, current spec. says
the raw property is enumberable. That sounds like a bug I'll fix. (don't want
"raw" showing up if somebody for-in enumerates the call-site object.
Allen
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