JavaScript join Array objects [duplicate]

Question

array = [
  {name:'alfa', firstValue:{value:'100'}},
  {name:'alfa', secoundValue:{value:'200'}},
  {name:'alfa', thirdValue:{value:'300'}}
]

I'm looking for a way to copy objects props into unique when the value name are the same, how can I do this, see expected result below:

array = [
  {name:'alfa', firstValue:{value:'100'}, secoundValue:{value:'200'}, thirdValue:{value:'300'}},
]

Spectric · Accepted Answer · 2021-08-24 18:54:50Z

1

You can use Array.reduce and Object.assign:

array = [
  {name:'alfa', firstValue:{value:'100'}},
  {name:'alfa', secoundValue:{value:'200'}},
  {name:'alfa', thirdValue:{value:'300'}}
]

const result = array.reduce((a, b) => {
  let found = a.find(e => e.name == b.name);
  found ? Object.assign(found, b) : a.push(b);
  return a;
}, [])

console.log(result);

answered Aug 24, 2021 at 18:54

Spectric

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2 Comments

bernlt Over a year ago

Thanks I was looking for exactly reducer + object assign, works great!

Gershom Maes Over a year ago

The main downside here is O(n^2) performance; besides that it's a fine solution

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