Creating a nested Javascript Object from an array of Strings [duplicate]

Question

What's the best way to create a N levels nested object (where N is the size of the array) for example:

const arr = ['a','b','c','d']

The output object should look like this:

{
  a: {
    b: {
      c: {
        d: true
      }
    }
  }
}

Please also include the code that you wrote that isn't properly working. — justDan
– justDan, Commented Sep 5, 2019 at 14:35
Use reduceRight with true as initialValue arr.reduceRight((r, k) => ({ [k]: r }), true) — adiga
– adiga, Commented Sep 5, 2019 at 14:41

Avanthika · Accepted Answer · 2019-09-05 14:39:22Z

3

You can use array.reduce, it helps you pass an accumulator where you can accumulate your nested obj.

const array = ['a','b','c','d'];
const object = {};
array.reduce((o, s) => { 
  return o[s] = {};
}, object);
console.log(object);

answered Sep 5, 2019 at 14:39

Avanthika

4,1821 gold badge15 silver badges19 bronze badges

Sign up to request clarification or add additional context in comments.

1 Answer 1