At the very least, WeakMaps are potentially usable today (depending on the
target audience) while symbols are nowhere in sight. I’ve gotten a lot of
mileage out of this function, which as you said provides a similar
effective result as symbols (they differ in that the WeakMap version isn’t
inherited):
function createStorage(creator){
var store = new WeakMap;
creator || (creator = Object.create.bind(null, null, {}));
return function(obj){
var priv = store.get(obj);
if (!priv) store.set(obj, priv = creator(obj));
return o;
};
}
// usage
var _ = createStorage();
function Ctor(val){
_(this).private = val;
}
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