These are computed properties and Allen has already added them to the latest ES6 draft.
ComputedPropertyName : [ AssignmentExpression ] Rick On Fri, Jul 19, 2013 at 7:09 AM, Jussi Kalliokoski < [email protected]> wrote: > Hi everyone, > > This is almost purely a syntactic sugar proposal, and if there's already a > proposal like this being/been discussed, please point me that way, I > couldn't find anything. Anyway, the use case is as follows: > > You have keys that come, for example from a config file or are defined as > constants, and you want to create objects with those keys. What you > currently have to do is to use a mix of object notation syntax and > assignment: > > myObject = { > someKey: 'someValue' > }; > myObject[MY_KEY_ID] = 'my value'; > > This is usually ok, but it's a bit confusing to read especially if the > object is long and you try to find the definition inside the brackets but > can't. Also, as far as I know, `"someKey"` and `MY_KEY_ID` end up being > defined differently; I doubt that the latter matters much, but what I have > in mind would fix both things: > > myObject = { > someKey: 'someValue', > [MY_KEY_ID]: 'my value' > }; > > So basically you could use brackets to signify that the key is the value > of an expression inside the brackets. > > Cheers, > Jussi > > _______________________________________________ > es-discuss mailing list > [email protected] > https://mail.mozilla.org/listinfo/es-discuss > >
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