How to search same values from the dynamic array and also sum that values using JS

Question

I have a dynamic object like :

 [ 
  { age: 35 },
  { weight: 60 },
  { age: 50 },
  { weight: 54 },
  { height: 175 },
  { age: 3.5 }
]

I want to find and the sum same value like that:-

 [ 
  { age:88.5 },
  { height: 175 },
  { weight: 114 }
 ]

No validated answer here, but it could help you : stackoverflow.com/questions/40262445/… — zken
– zken, Commented Jul 17, 2019 at 12:55
Possible duplicate of Merge objects with same key in javascript — Calvin Nunes
– Calvin Nunes, Commented Jul 17, 2019 at 12:55
Try doing something, search "walking json" or "traverse" medium.com/front-end-weekly/… — Ferhat BAŞ
– Ferhat BAŞ, Commented Jul 17, 2019 at 12:56
Why does the result is an array of object with a single property which, if the code works properly, should be unique keys? You should store it in a single object: way easier to manipulate. — Karl-André Gagnon
– Karl-André Gagnon, Commented Jul 17, 2019 at 12:57

MH2K9 · Accepted Answer · 2019-07-17 13:32:28Z

1

Use forEach() to make an iteration on array and another iteration on object element and calculate the sum.

let sum = {};
const data = [
    { age: 35 },
    { weight: 60 },
    { age: 50 },
    { weight: 54 },
    { height: 175 },
    { age: 3.5 }
]

data.forEach((item) => {
    for (let key in item) sum[key] = sum[key] ? sum[key] + item[key] : item[key]
})

console.log([sum])

Also we can use reduce() function to calculate the sum.

    const data = [
        { age: 35 },
        { weight: 60 },
        { age: 50 },
        { weight: 54 },
        { height: 175 },
        { age: 3.5 }
    ]

let sum = data.reduce((all, curr) => {
    let key = Object.keys(curr)[0];
    all[key] = all[key] ? all[key] + curr[key] : curr[key]
    return all
}, {})

console.log([sum])

edited Jul 17, 2019 at 13:32

answered Jul 17, 2019 at 12:56

MH2K9

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3 Comments

Karl-André Gagnon Over a year ago

This is the perfect case for .reduce() ;)

MH2K9 Over a year ago

@Karl-AndréGagnon yes, I didn't think it. :)

SHIVAM SHARMA Over a year ago

@Karl-AndréGagnon I tried it with reduce but I was unable to get any answer.

Ghoul Ahmed · Accepted Answer · 2019-07-17 13:07:19Z

1

Try this

const data  =   [ 
  { age: 35 },
  { weight: 60 },
  { age: 50 },
  { weight: 54 },
  { height: 175 },
  { age: 3.5 }
];

const result  = Object.entries(data.reduce((acc, ele)=> {
const key  = Object.keys(ele)[0];
acc[key]  = (acc[key]||0)+  ele[key]; return acc},[]))
.map(([k, v])=>({[k]:v}))

console.log(result);

answered Jul 17, 2019 at 13:07

Ghoul Ahmed

4,8192 gold badges17 silver badges25 bronze badges

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