Hi. With Set methods being discussed on next TC39 I would like to write second proposal - Map methods.
Currently I thought about: Map.prototype.filter(cb, thisArg) Map.prototype.mapValues(cb, thisArg) Map.prototype.mapKeys(cb, thisArg) Map.prototype.merge(iterable: Iterable.<Tuple.<*, *>>) Map.groupBy(iterable, keyDerivativeFunc) - analogus to lodash.groupBy <https://lodash.com/docs/4.17.4#groupBy>, but returning Map Instance. Map.keyBy(iterable, keyDerivativeFunc) - analogous to lodash.keyBy, but returning Map instance. I spend few minutes on writing code for simple polyfill - https://github.com/Ginden/map-methods/blob/master/polyfill.js and I'm gathering opinions what would be expected final shape of Map API. Michał Wadas
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