On Thu, Jan 18, 2018 at 12:37 PM, T.J. Crowder < [email protected]> wrote:
> On Thu, Jan 18, 2018 at 5:28 PM, 森建 <[email protected]> wrote: > > > > This code is redundant. I just want to write > > `mapA.assign(mapB, mapC);`. > > FWIW, it would be more in keeping with `Object.assign` if it were on `Map` > rather than `Map.prototype`. E.g., you'd write the code above like this: > What if, instead of a variety of assign methods, we respeced Object.assign to do this given a Map as the left-value? If Object.assign sees a "set" method of length 2, then it stores obj.set.bind(obj) and uses that rather than assigns to fields. Two points of potential controversy: - if an array is on the right, do we pass string or integer keys to the bound setter? - if we allow Maps on the right, we could allow WeakMaps on the left. Users might assume that WeakMap could then be used on the right.
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