is it possible to create an Object in javascript from looping data in array?

Question

just like the title said. i want to create a new object from data inside array below: the name of the object is the first and last name.

//this is the input
arrayToObject([['Christ', 'Evans', 'Male'], ['Robert', 'Downey', 'Male']]);

//this is output that i want

// 1. Christ Evans:
// { firstName: 'Christ',
//   lastName: 'Evans',
//   gender: 'Male',

// 2. Robert Downey:
// { firstName: 'Robert',
//   lastName: 'Downey',
//   gender: 'Male',


// this is code that i write
function arrayToObject(arr) {
  
  let ObjName=""
  for (let i = 0; i<arr.length;i++){
    
  
      let firstName=arr[i][0]
      let lastName=arr[i][1]
      let ObjName=firstName.concat(' ',lastName)
      let gender=arr[1][2]

      ObjName = { // idk how to make the object.
          'firstName':firstName,
          'lastName':lastName,
          'gender':gender,
          
      }
  }
  
}

im struggling in the part where i can declare the object.

`let objectFromArray = array.map(el=>({firstName : el[0], lastName:el[1], gender : el[2]}))` — Nico, Jan 14 '20 at 11:58
The output that you want isn't an object, it's some text followed by an object. Or do you want something like `{'Christ Evans':{firstName:'Christ',...},'Robert Downey': {...}}`. — RobG, Jan 14 '20 at 12:04
please add how the result should look like. do you want an array of objects? or just a single object? — Nina Scholz, Jan 14 '20 at 12:04

Terry · Answer 1 · 2020-01-14T11:59:50.880

I would suppose you want an array of objects with the following structure:

[
  {
    "firstName": "Christ",
    "lastName": "Evans",
    "gender": "Male"
  },
  {
    "firstName": "Robert",
    "lastName": "Downey",
    "gender": "Male"
  }
]

If that's the case, you can simply use Array.prototype.map, and in the callback you simply use array destructuring to unpack the second level array into firstName, lastName and gender:

function arrayToObject(arr) {
  return arr.map((entry) => {
    const [firstName, lastName, gender] = entry;
    return {
      firstName,
      lastName,
      gender
    };
  });
}

const a = arrayToObject([['Christ', 'Evans', 'Male'], ['Robert', 'Downey', 'Male']]);
console.log(a);

score -1 · Accepted Answer · answered Jan 14 '20 at 11:58

-1

You could take a nested approach with Object.fromEntries and map the properties with a keys array.

var data = [['Christ', 'Evans', 'Male'], ['Robert', 'Downey', 'Male']],
    keys = ['firstName', 'lastName', 'gender'],
    result = Object.fromEntries(data.map(a => [
        a.slice(0, 2).join(' '),
        Object.fromEntries(keys.map((k, i) => [k, a[i]]))
    ]));

console.log(result);

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

answered Jan 14 '20 at 11:58

Nina Scholz

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what is wrong with it? – Nina Scholz Jan 14 '20 at 12:00
No idea: somebody is on a downvote streak for no reason... :/ your answer is just as legit :) – Terry Jan 14 '20 at 12:01
no downvote from me, but why not just `.map` function? – Nico Jan 14 '20 at 12:01
i get it now he would to have something like dynamic variable names – Nico Jan 14 '20 at 12:02
1

"*i want to create **a new object** from data inside array below: **the name of the object is the first and last name.***" [emph: me] – Nina Scholz Jan 14 '20 at 12:03

is it possible to create an Object in javascript from looping data in array?

2 Answers2