Suggest Object.compare(lert, right)
nemo1275 at gmail.com
Mon Sep 19 05:32:11 UTC 2016
Well, this proposal is not for check equality. Its purpose is to compare
two object that which object is `greater`.
I'm sure this feature is already implemented for every modern js engines,
as it's needed to implement Map/Set. But we don't have js interface for it
yet. Thus proposal is to expose this functionality to userland application.
2016. 9. 19. 오후 2:26에 "Jordan Harband" <ljharb at gmail.com>님이 작성:
> This may have already been proposed as https://github.com/
> sebmarkbage/ecmascript-shallow-equal - if so, you'll want to post your
> comments there.
> On Sun, Sep 18, 2016 at 10:10 PM, Park Hyeonu <nemo1275 at gmail.com> wrote:
>> tl;dr - deterministic function that compares arbitrary objects
>> I know now we have `Map` and `Set`, but sometimes we need more low level
>> ones. Especially for library developers.
>> For the case, say, I want to implement a map whose key can be a arbitrary
>> number of objects. Currently this can only implemented as nested map whose
>> structure is `keylen -> key1 -> key2 -> ... -> value`. Not really elegant.
>> But if we have `Object.compare()`, `(key1, key2, ...) -> value` is possible.
>> As its intended purpose is to be used with custom map/set, I don't think
>> we should define how this function works in spec. Just guaranteed to be
>> deterministic in each runtime is enough.
>> For detail, this function follows `(left: any, right: any) => number`
>> form. When `Object.is(left, right)` is true, `Object.compare(left, right)`
>> must return `0`. Otherwise, the result must be deterministic, means
>> whenever(in same runtime) we call this function with same arguments it
>> should return same value(or at least, always greater than/lesser 0).
>> Seems good?
>> es-discuss mailing list
>> es-discuss at mozilla.org
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