Catching up on this discussion. Personally, I'd like to see us come to quick consensus on `forEach` for collections, because without something like `forEach`, it's impossible to implement useful versions of these collections in user-space in browsers that do not implement for-of.
Indeed, the current browsers that implement Map and Set do not implement for-of, which means that even though browsers implement the collections (and Mozilla has for a bit now), they are not very useful because they cannot be iterated over. Had `forEach` been part of the initial spec, I would be using them today. One last thing: `forEach` on `Map` should probably pass the key and value to the function. Yehuda Katz (ph) 718.877.1325
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