how can i sum total of this objects keys?

October 3, 2022

[
    {A: 47.5, B: 23.4, C: 32.4, D: 12.5, E: 18.2},
    {D: 10, C: 22.5, A: 85.7, E: 48.6},
    {B: 93.45, D: 37.1, E: 66.34},
    {A: 0, D: 0,  C: 0,  B: 8.50, E: 78.5},
    {C: 0, A: 0, B: 11.7, E: 0},
    {E: 89.4, D: 16.5, B: 29.7, A: 84.5}
]

i try some similar to this, but only works in order arrays, i need the sum of the key´s now

const totals = new Array(StoreResumeRows.length).fill(0)
   StoreResumeRows.map((matrixRow: any) => {
     for(let index = 0; index < totals.length; index++){
       totals[index] += matrixRow[index]
   }
 })
 console.log(totals)

the output i need it´s like this

[{A: 217.7, B: 166.75, C: 54.9, D: 76.1, E: 301.04}]

>Solution :

You can use Array.reduce to iterate the objects in your array, using a forEach over Object.entries to add each value from those objects to the totals result:

const StoreResumeRows = [
    {A: 47.5, B: 23.4, C: 32.4, D: 12.5, E: 18.2},
    {D: 10, C: 22.5, A: 85.7, E: 48.6},
    {B: 93.45, D: 37.1, E: 66.34},
    {A: 0, D: 0,  C: 0,  B: 8.50, E: 78.5},
    {C: 0, A: 0, B: 11.7, E: 0},
    {E: 89.4, D: 16.5, B: 29.7, A: 84.5}
]

const totals = StoreResumeRows.reduce((acc, obj) => {
  Object.entries(obj).forEach(([k, v]) => acc[k] = (acc[k] || 0) + v)
  return acc
}, {})

console.log(totals)