Yeah, some languages have this functionality available for maps, e.g. Erlang http://erlang.org/doc/man/maps.html#map-2. Might be a good addition, although considering `Map` instead of `Object` is worth as well. (although, when we were discussing of adding `Map.prototype.map/filter`, it was decided that it's better to add them on iterators).
Dmitry On Fri, Jan 29, 2016 at 3:07 PM, Kaustubh Karkare < [email protected]> wrote: > I have recently come to feel the need for Object.map, which is like > Array.map, > except that it receive keys instead of indices. > > Object.prototype.map = function(mapFn, context) { > return Object.keys(this) > .reduce(function(result, key) { > result[key] = mapFn.call(context, this[key], key, this); > return result; > }, {}); > }; > > Without this, I frequently do the exact same thing as the above manually, > which leads to unnecessary code duplication. > > Given that, it might make sense to match other methods from Array.prototype > > Object.map > Object.filter > Object.every > Object.some > Object.reduce > Object.find > Object.findKey // like Array.findIndex > > Note that wherever applicable, the ordering is non-deterministic. > > > _______________________________________________ > es-discuss mailing list > [email protected] > https://mail.mozilla.org/listinfo/es-discuss > >
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