How to move object properties inside an array of objects

Question

I have an array of objects like this:

currentArray = [
  {
    year: 2011,
    asset: {
      silver: 322,
      gold: 325,
    },
  },
  {
    year: 2012,
    asset: {
      silver: 411,
      gold: 2235,
    },
  },
];

What needs to be done in JavaScript/TypeScript, to change it from the current structure to the structure below? The silver- and gold-property of each asset-object should be stored in the object above, next to 'year', and the asset-objects need to be deleted:

desiredArray = [
  {
    year: 2011,
    silver: 322,
    gold: 325,
  },
  {
    year: 2012,
    silver: 411,
    gold: 2235,
  },
];

@felixkling recursion is overkill for this. It just needs a simple map. `const result = currentArray.map(({year, asset}) =>({year, ...asset}));` — pilchard, Sep 23 '21 at 11:45

Harshit Rastogi · Accepted Answer · 2021-09-23T11:47:19.623

1

let currentArray = [{
    year: 2011,
    asset: {
      silver: 322,
      gold: 325,
    },
  },
  {
    year: 2012,
    asset: {
      silver: 411,
      gold: 2235,
    },
  },
];

currentArray.map(item => {
  Object.assign(item, item.asset)
  delete item.asset;
  
  return item
})

console.log(currentArray)

edited Sep 23 '21 at 11:47

answered Sep 23 '21 at 11:44

Harshit Rastogi

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1

Even easier: `Object.assign(item, item.asset)`. But if you mutate the array, don't use `.map`. – Felix Kling Sep 23 '21 at 11:44

How to move object properties inside an array of objects

1 Answers1