CODEWITHSUNDEEP
javascript
alex
alex

Reputation: 7601

Why isn't the index being set properly for following cloned array?

I'm trying to clone an array, reset the index (0, 1, 3 ...) and save this array in a buildingsPayload variable:

console.log('1:', this.buildings)

const buildingsPayload = this.buildings.map((building, index) => {
  return Object.assign({ index: index }, building)
})

console.log('2:', buildingsPayload)

The index in console.log('1') is:

[
  { index: 0 },
  { index: 0 },
  { index: 1 }
]

And the index in console.log('2') is also:

[
  { index: 0 },
  { index: 0 },
  { index: 1 }
]

How to modify this code so buildingsPayload ends up like:

[
  { index: 0 },
  { index: 1 },
  { index: 2 }
]

Upvotes: 0

Views: 24

Answers (1)

Ry-
Ry-

Reputation: 225044

Later objects’ keys override those of earlier objects in Object.assign, so you need to specify { index: index } last:

const buildingsPayload = this.buildings.map((building, index) =>
  Object.assign({}, building, { index: index }))

Upvotes: 2

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