I was worried that compiler may optimize such sings as order of properties
initialization, while async/await may be a reason for doing so. Thank you.
четверг, 18 мая 2017 г., 13:50:54 UTC+3 пользователь Jakob Kummerow написал:
>
> An object literal {x: ..., y: ...} will always create the properties x and
> y in this order. This is unrelated to async/await (in fact, if you dropped
> all "async"/"await" keywords from your example, it would work exactly the
> same).
>
> On Wed, May 17, 2017 at 7:13 PM, Aleksey <[email protected]
> <javascript:>> wrote:
>
>> consider code
>>
>> ;(async () => {
>> const o = {
>> f: async () => {
>> const x = await Promise.resolve(1)
>> o.y = 3
>> return x
>> },
>> }
>> console.log({
>> x: await o.f(),
>> y: o.y,
>> })
>> })()
>>
>> will output
>>
>> { x: 1, y: 3 }
>>
>> But if we change order of object field definition to
>>
>> ...
>> console.log({
>> y: o.y,
>> x: await o.f(),
>> })
>> ...
>>
>> result will be
>>
>>
>> { y: undefined, x: 1 }
>>
>> The question is: is this behavior guaranteed? I mean if sequence will be
>> like
>>
>> console.log({
>> x: await o.f(),
>> y: o.y,
>> })
>>
>> would result always be like
>>
>> { x: 1, y: 3 }
>>
>>
>> and never like
>>
>> { y: undefined, x: 1 }
>>
>> ?
>>
>> Thanks
>>
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>
>
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