recursion in nested javascript object

Question

find the addition of nested object using recursion here my sum is always passed as 10 ??......... I am trying to add sum value in else condition but in if it always pass as 10

let abc = { a: 10, b: { a: 20 }, c: { b: { a: 30 } } };

const Formation = (obj,sum) =>{

  for(let ky in obj) {
    if (typeof obj[ky] == 'object') {
       Formation(obj[ky],sum);
    } else {
      sum += obj[ky] ? obj[ky] : 0;
    }
  // console.log(sum)
  }
  return sum;
}

console.log('res: ', Formation(abc, 0));

You need replace Formation(obj[ky],sum); with sum += Formation(obj[ky],sum); — Alexander Paschenko
– Alexander Paschenko, Commented Apr 20, 2022 at 9:46

Alexander Paschenko · Accepted Answer · 2022-04-20 09:56:27Z

1

Yes, it's because you don't use returned value from nested Formation. You need make some changes to your code:

let abc = { a: 10, b: { a: 20 }, c: { b: { a: 30 } } };

const Formation = (obj) =>{
  let sum = 0;

  for(let ky in obj){
    if(typeof obj[ky] == 'object'){
      sum += Formation(obj[ky]);
    }
    else{
      sum += obj[ky] ? obj[ky] : 0;
    
    }
  // console.log(sum)
  }
  return sum;
}

answered Apr 20, 2022 at 9:56

Alexander Paschenko

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