How to sum each value inside array of object to new variable-CodePudding

I have a data like this :

const fund = 
[
 {
  id: 1234,
  totalAmount: 0,
  data: 
   [
    {
     id: 1234,
     amount: '4.000'
    },
    {
     id: 1234,
     amount: '3.000'
    }
   ]
 },
 {
  id: 12345,
  totalAmount: 0
 },
 {
  id: 123456,
  totalAmount: 0
  data: 
   [
    {
     id: 123456,
     amount: '3.000'
    },
    {
     id: 123456,
     amount: '5.000'
    }
   ]
 }
]

I want to sum the amount inside of data each id to a key called totalAmount. But not all the parent id have data key.

here's my desired output :

const fund = 
[
 {
  id: 1234
  data: 
   [
    {
     id: 1234,
     amount: '4.000'
    },
    {
     id: 1234,
     amount: '3.000'
    }
   ],
  totalAmount: 7000
 },
 {
  id: 12345,
  totalAmount: 0        
 },
 {
  id: 123456,
  data: 
   [
    {
     id: 123456,
     amount: '3.000'
    },
    {
     id: 123456,
     amount: '5.000'
    }
   ],
  totalAmount: 8000
 }
]

I was trying with this code :

fund.forEach((elA, i) => {
        if (elA.data) {
          const total = funders[i].data.reduce((acc, curr) => {
            acc  = parseInt(curr.amount.replace(/\./g, ''))
            return acc
          })
          fund[i] = total ? {...elA, totalAmount: total} : elA;
        }
      })

But it's not summing like i want.

Where's my mistake ?

Please ask me if you need more information if it's still not enough to solve that case.

CodePudding user response：

You need to define the initial value for the reduce iterator.

fund.forEach((elA, i) => {
        if (elA.data) {
          const total = funders[i].data.reduce((acc, curr) => {
            acc  = parseInt(curr.amount.replace(/\./g, ''))
            return acc
          }, 0)
          fund[i] = total ? {...elA, totalAmount: total} : elA;
        }
      });

Another alternative for the same code:

fund.forEach(elA => {
  if (elA.data) {
    const total = elA.data.reduce((acc, curr) => {
      return acc   parseInt(curr.amount.replace(/\./g, ''))
    }, 0)
    elA.totalAmount = total;
  }
});