What kind of construct/pattern is this type of assignment?

Asked Jan 14 '20 at 17:02

Active Jan 14 '20 at 17:55

Viewed 33 times

I have the following block of borrowed code in one of my JS projects:

return Promise.all(accessoryGetMethods)
.then(systemAccessories => {
  const [partitions, sensors, lights, locks] = systemAccessories
  return {
    id: res.data.id,
    attributes: res.data.attributes,
    partitions: partitions.map(p => p.data),
    sensors: typeof sensors != 'undefined' ? sensors.data : [],
    lights: typeof lights != 'undefined' ? lights.data : [],
    locks: typeof locks != 'undefined' ? locks.data : [],
    relationships: rels
  }
})

In particular, what kind of assignment pattern is the line:

 const [partitions, sensors, lights, locks] = systemAccessories

edited Jan 14 '20 at 17:55

jonrsharpe

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asked Jan 14 '20 at 17:02

Mike Kormendy

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It's called array destructuring. – Roberto Zvjerković Jan 14 '20 at 17:02
More specifically https://stackoverflow.com/q/3986348/3001761 – jonrsharpe Jan 14 '20 at 17:05
@jonrsharpe - ***Wow*** – T.J. Crowder Jan 14 '20 at 17:07
@T.J.Crowder ?? – jonrsharpe Jan 14 '20 at 17:07
@jonrsharpe - As in: ***Wow***, I'd either forgotten or never learned that JavaScript 1.7 had destructuring, so I'm amazed to see a 10-year-old dupetarget. Of course, it's arguably different now (iterators), but... – T.J. Crowder Jan 14 '20 at 17:08

What kind of construct/pattern is this type of assignment?

0 Answers0