Build Nested Object in Javascript

Question

I trying to build a nested object, I'll try to make myself clear.

I have this json structure:

 {
      "origin.geo.country": "USA",
      "origin.geo.state": "NY",
      "origin.geo.zip": 4444,
      "user.name": "Michael",
      "user.surname": "Jordan"  
}

And I need a function that outputs something like this:

{
     origin: {
         geo: {
             country: "USA",
             state: "NY",
             zip: 4444
         }
     },
     user: {
         name: "Michael",
         surname: "Jordan"
     }
 }

I know i have to use recursion to achieve this, but I'm not able to code it. Can you guys help me with this?

Thanks.

@BenBeck Just use the close link when you want to mark a question as a duplicate and it adds the comment for you :) — Reinstate Monica Cellio, Nov 17 '17 at 14:45

score 2 · Accepted Answer · answered Nov 17 '17 at 14:55

So guys,

@Ben Beck answer helped me.

I just need to make some minor changes to the function:

function (path,value,obj) {

    var parts = path.split("."), part;

    //reference the parent object
    var parent = obj;

    while(part = parts.shift()) {

        // here I check if the property already exists
        if( !obj.hasOwnProperty(part) ) obj[part] = {};

        // if is the last index i set the prop value
        if(parts.length === 0) obj[part] = value;

        obj = obj[part]; // update "pointer"
    }

    //finally return the populated object
    return parent;

}

kind user · Answer 2 · 2017-11-17T15:13:32.990

0

You could reach the desired solution using e.g. Array#reduce.

const o = {
  "origin.geo.country": "USA",
  "origin.geo.state": "NY",
  "origin.geo.zip": 4444,
  "user.name": "Michael",
  "user.surname": "Jordan",
};

const r = Object.keys(o).reduce((s, a) => {
  const t = a.split('.');
  const k = t[0];
  const v = t[t.length - 1];
  k in s ? s[k][v] = o[a] : s[k] = Object.assign({}, { [v]: o[a] });
  return s;
}, {});

console.log(r);

edited Nov 17 '17 at 15:13

answered Nov 17 '17 at 14:49

kind user

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This has already been answered. You should be marking this to be closed. – Reinstate Monica Cellio Nov 17 '17 at 14:50
@Archer Where it was answered? – kind user Nov 17 '17 at 14:50
See the 2 "Possible duplicate.." links under the question – Reinstate Monica Cellio Nov 17 '17 at 14:51
1

@Archer Well, this is just another approach to that problem. Show me **exactly** the same solution and I will **remove** my answer **immediately**. – kind user Nov 17 '17 at 14:53

Build Nested Object in Javascript

2 Answers2

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