Convert part of an Object from numeric keys to Array in Javascript

Question

I have the following Object

let demo = {a:'b', c:{0:{id:'one'},1:{id:'two'}}, d:{0:{country: {0:{name:'mx'},1:{name:'usa'}} }} };

The keys, example (0, 1), are integrated into an array, as shown below:

let result = {a:'b', c:[{id:'one'},{id:'two'}], d:[{country:[{name:'mx'},{name:'usa'}] }] };

Any idea how to do it?

Ori Drori · Accepted Answer · 2018-10-24 17:19:21Z

1

You can recursively reduce the object to new object, and convert each object that has the key 0 to an array using Object.values():

const demo = {a:'b', c:{0:{id:'one'},1:{id:'two'}}, d:{0:{country: {0:{name:'mx'},1:{name:'usa'}} }} };

const arrayfy = (o) => Object.entries(o)
  .reduce((r, [k, v]) => {
    if(typeof v === 'object') {
      const t = arrayfy(v);
      r[k] = '0' in v ? Object.values(t) : arrayfy(t);
    } else {
      r[k] = v;
    }
  
    return r;
  }, {});
  
const result = arrayfy(demo);

console.log(result);

answered Oct 24, 2018 at 17:19

Ori Drori

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