How to represent array with nested arrays as an object

Question

This is my code

let array = [
  [
    ['firstName', 'Mary'],
    ['lastName', 'Jenkins'],
    ['age', 36],
    ['gender', 'female'],
  ],
  [
    ['lastName', 'Kim'],
    ['age', 40],
    ['gender', 'female'],
  ],  [
    ['firstName', 'Joe'],
    ['age', 42],
    ['gender', 'male'],
  ],
]

array.map(function (el) {
   return Object.assign({}, el)
})

However this is how it appears in the console

I've tried array.flat() but did not work as intended

I want the result to look something like this

[[{firstName : 'Mary'}.{lastName : 'jenkins'},..],...]

Mr. Polywhirl · Accepted Answer · 2021-02-17 15:31:15Z

Do you want a list of objects, or a list of a list of key-value (pair) objects?

List of objects

let array = [
  [
    ['firstName', 'Mary'],
    ['lastName', 'Jenkins'],
    ['age', 36],
    ['gender', 'female'],
  ],
  [
    ['lastName', 'Kim'],
    ['age', 40],
    ['gender', 'female'],
  ],  [
    ['firstName', 'Joe'],
    ['age', 42],
    ['gender', 'male'],
  ],
]

const listOfObjects = array.map(Object.fromEntries);

console.log(listOfObjects.map(JSON.stringify).join('\n'));

.as-console-wrapper { top: 0; max-height: 100% !important; }

List of list of object properties

let array = [
  [
    ['firstName', 'Mary'],
    ['lastName', 'Jenkins'],
    ['age', 36],
    ['gender', 'female'],
  ],
  [
    ['lastName', 'Kim'],
    ['age', 40],
    ['gender', 'female'],
  ],  [
    ['firstName', 'Joe'],
    ['age', 42],
    ['gender', 'male'],
  ],
]

const listOfListOfPairs = array.map(items =>
  items.map(item =>
    Object.fromEntries([item])));

console.log(listOfListOfPairs.map(JSON.stringify).join('\n'));

.as-console-wrapper { top: 0; max-height: 100% !important; }

Jack McKay Fletcher · Accepted Answer · 2021-02-17 15:31:15Z

1

you can use Object.fromEntries.

in your case something like this would work:

let array = [
  [
    ['firstName', 'Mary'],
    ['lastName', 'Jenkins'],
    ['age', 36],
    ['gender', 'female'],
  ],
  [
    ['lastName', 'Kim'],
    ['age', 40],
    ['gender', 'female'],
  ],  [
    ['firstName', 'Joe'],
    ['age', 42],
    ['gender', 'male'],
  ],
]

const asObjects = array.map((entries) => Object.fromEntries(entries))
console.log(asObjects)

answered Feb 17, 2021 at 15:31

Jack McKay Fletcher

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How to represent array with nested arrays as an object

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List of objects

List of list of object properties

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