how can i create this array from this starting array?

Question

Hi there i have this starting array:

names = [ '1A', '1B', '1C', '1D', '1E'];

which I need for later on in my application to see who's turn it is. I need to be able to store some values in a different kind of array like so:

scores = [
  {
    id: "1A",
    endScores: {}
  },
  {
    id: "1B",
    endScores: {}
  },
  {
    id: "1C",
    endScores: {}
  },
  {
    id: "1D",
    endScores: {}
  },
  {
    id: "1E",
    endScores: {}
  }
];

How is it possible to get from my first array to the second array? The first array can also change in its size there can be more or less names in there... Hope there is a possible way. PS: I'm using Angular 2.

@AlekseyL.could u pls be a bit more specific as im new to javascript and these arrays are blowing my mind appart :( — ArcherMark
– ArcherMark, Commented Dec 28, 2018 at 13:56

lukaleli · Accepted Answer · 2018-12-28 13:57:09Z

2

This is how you can map your names array into desired collection.

const names = [ '1A', '1B', '1C', '1D', '1E'];

const transformToScores = names => names.map(id => ({id, endScores: {}}))

const scores = transformToScores(names)

console.log(scores)

answered Dec 28, 2018 at 13:57

lukaleli

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5 Comments

ArcherMark Over a year ago

will this then edit names? or will names stay like the original form?

lukaleli Over a year ago

@ArcherMark what do you mean? names are mapped to id property in the second collection without any transformation.

ArcherMark Over a year ago

will the array of names stay in the format it was original or will that array be changed? i see that with youre code u are also creating a new array called scores. _transformToScores = names => _ this line is what is confusing me where my brain is saying that the names array is getting changed. But since i am new i could be completely wrong ...

lukaleli Over a year ago

@ArcherMark no, it stays the same. There's no mutability here. map method always returns new array.

lukaleli Over a year ago

@ArcherMark if this answers your question please mark this answer as correct. Thanks.

dquijada · Accepted Answer · 2018-12-28 13:57:44Z

1

Using the map method it's pretty easy:

const names = [ '1A', '1B', '1C', '1D', '1E'];

const scores = names.map(name => {
  let item = {
    id: name,
    endScores: {}
  }
  return item;
})

console.log(scores);

answered Dec 28, 2018 at 13:57

dquijada

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Comments

Biswadev · Accepted Answer · 2018-12-28 14:02:40Z

0

var names = [ '1A', '1B', '1C', '1D', '1E'];

const newnames=names.map(Id=>Object.assign({},{
    id: Id,
    endScores: {}
    }
    ))
console.log(newnames)

answered Dec 28, 2018 at 14:02

Biswadev

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