On 7/16/2013 4:56 PM, Brendan Eich wrote:
Mark's suggestion seems better because it throws on random wrong this
but supports strict calls by unqualified name.
I don't think that it'd be nice if `Map()` could throw or not throw
depending on strictness of the caller. Working around that requires
something like:
function Map(...args){
if (this === undefined || this === %CallerGlobal()) {
return new Map(...args);
} else if (!%HasMapData(this)) {
throw new TypeError("Not a Map");
} else if (%HasInitializedMapData(this)) {
throw new TypeError("Map is already initialized");
}
%MapInitialize(this);
}
(V8's implementation is also incorrect in that it doesn't throw when you
do `Map.call(new Map)`) (so is SM's)
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