Convert an array of objects to an object

Question

I have an array of objects like this

const values = [{
    existing_value: 'Headline 56',
    new_value: 'Headline_new56',
  },
  {
    existing_value: 'Headline 59',
    new_value: 'Headline_new59',
  },
]

And I want to convert into this form.

const newObject = { "Headline 56": "Headline_new56",  "Headline 59": "Headline_new59"}

I was thinking something like this could work

const newObject = {}

const testvalues = values.map(obj => Object.assign( newObject, obj.existing_value: obj.new_value))

Syntactically it's not quite right. What is the best way to go about it?

cmgchess · Accepted Answer · 2022-07-19 09:40:28Z

4

Object.fromEntries is a possible approach

const values = [{
    existing_value: 'Headline 56',
    new_value: 'Headline_new56',
  },
  {
    existing_value: 'Headline 59',
    new_value: 'Headline_new59',
  },
]

const newObj = Object.fromEntries(values.map(({existing_value,new_value})=>[existing_value,new_value]))

console.log(newObj)

answered Jul 19, 2022 at 9:40

cmgchess

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Comments

Jay · Accepted Answer · 2022-07-19 09:40:58Z

1

Use Array reduce

const values = [{
    existing_value: 'Headline 56',
    new_value: 'Headline_new56',
  },
  {
    existing_value: 'Headline 59',
    new_value: 'Headline_new59',
  },
];

const obj = values.reduce((a, b) => ({ ...a,
  [b.existing_value]: b.new_value
}), {})

console.log(obj)

answered Jul 19, 2022 at 9:40

Jay

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Comments

Ricardo Garcia Landete · Accepted Answer · 2022-07-19 09:59:07Z

0

Extracted from mozilla webdocs

const values = [{
        existing_value: 'Headline 56',
        new_value: 'Headline_new56',
    },
    {
        existing_value: 'Headline 59',
        new_value: 'Headline_new59',
    },
];

const newObj = values.map((obj) => {
    var rObj = {};
    rObj[obj.existing_value] = obj.new_value;
    return rObj;
});

console.log(newObj);

answered Jul 19, 2022 at 9:59

Ricardo Garcia Landete

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