CODEWITHSUNDEEP
javascript
freebiker
freebiker

Reputation: 37

How to change object value within an array of objects with one from another array of objects?

Considering the two arrays bellow:

let aaa = [{label: "nu", angle: 5}, {label: "na", angle: 3}]
let bbb= [{label: "nu", angle: 2}, {label: "na", angle: 6}]

How can I add the value on the key from one object with the corresponding one from the next array of objects and return one object or the other.

the result should be:

let ccc= [{label: "nu", angle: 7}, {label: "na", angle: 9}]

I have no idea how to solve this

Upvotes: 0

Views: 40

Answers (1)

Fraction
Fraction

Reputation: 12964

You can use Array.reduce() and Array.findIndex() like this:

let aaa = [{label: "nu", angle: 5}, {label: "na", angle: 3}];
let bbb= [{label: "nu", angle: 2}, {label: "na", angle: 6}];

const ccc = [...aaa, ...bbb].reduce((acc, a) => {
  const i = acc.findIndex(o => o.label === a.label);

  if(i === -1) { acc.push(a); return acc; }
  
  acc[i].angle += a.angle;
  return acc;      
 }, []);
 
 console.log(ccc);

Upvotes: 1

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