Hi, Firefox has implement a Map/Set.prototype.size *method* to query the number of mapping/elements. It's not in the strawman. It appears in the latest draft, though weirdly enough Map.prototype.size is a function with an unused argument. What about making it an getter instead of a function? I guess we also don't need the extra parens to request for Map#keys, Map#values, Map#items.
Unlike Java, JavaScript is lucky enough to have getter/setters, we should use them, even in the spec. The boat for myArray.length has sunk a while ago, but new constructs can get this right. David
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