Compare 2 objects and update the matching object in javascript

Question

I want to compare 2 array of objects and update the matching object as well as total count in the object

let arr1 = [{status: 'Total', count: 0, text: 'Total applications'},
{status: 'submitted', count: 0, text: 'Applications submitted'},
{status: 'Rejected', count: 0, text: 'Applications rejected'}]

let arr2 = [
   {status: "submitted", count: 20} ,
{status: "Rejected", count: 10}
]

function

 let finalResult = arr2.map(function(a){
       var result=arr1.filter(b=> a.status==b.status ?  {...a, count:b.count} : arr1[0].count:arr1[0].count  );
       return result
     
   })

Final Result should be like this:

 [{status: 'Total', count: 30, text: 'Total applications'},
{status: 'submitted', count: 20, text: 'Applications submitted'},
{status: 'Rejected', count:10, text: 'Applications rejected'}
]

if these status are unique, why don't you have them as object keys instead of array ? — Code Maniac
– Code Maniac, Commented Jul 5, 2022 at 4:31

Code Maniac · Accepted Answer · 2022-07-05 04:38:08Z

You can simply loop through second array and build a hash map and also find total value. now just loop over first array and update values accordingly

let arr1 = [{status: 'Total', count: 0, text: 'Total applications'},{status: 'submitted', count: 0, text: 'Applications submitted'},{status: 'Rejected', count: 0, text: 'Applications rejected'}]

let arr2 = [{status: "submitted", count: 20} ,{status: "Rejected", count: 10}]

let total = 0;
let obj = {}

// finding total and build hash map
arr2.forEach(data => {
  obj[data.status] = obj[data.status] || data
  total += data.count
})

// loop over first array and update count accordingly
let final = arr1.map(data => {
  if(data.status === 'Total'){
    return {...data, count: total}
  } else if(data.status in obj){
    return {...data, ...obj[data.status]}
  } else {
    return data
  }
})

console.log(final)

Andy · Accepted Answer · 2022-07-05 04:59:05Z

First find the object with the Total status. Then loop over the second array of objects, find each object's index within the first array, update the count of the object, then finally update the total count.

let arr1=[{status:"Total",count:0,text:"Total applications"},{status:"submitted",count:0,text:"Applications submitted"},{status:"Rejected",count:0,text:"Applications rejected"}],arr2=[{status:"submitted",count:20},{status:"Rejected",count:10}];

let total = arr1.find(obj => obj.status === 'Total');

for (const obj of arr2) {

  const { count } = obj;

  const index = arr1.findIndex(o => {
    return o.status === obj.status
  });
  
  arr1[index].count = count;

  total.count += count;

}

console.log(arr1)

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