How can I store previous values instead of storing the value in array of objects in react state

Question

I am storing the prev values in an array of objects, for example [{ActFollow: 'BlN'},{ActSendGift: 'BlY'},{ActSubscribe: 'BlY'}] I want to store the key and values in an object like this {ActFollow: 'BlN',ActSendGift: 'BlY', ActSubscribe: 'BlY'}

  const [activityTypes, setActivityTypes] = useState<any>([]); // state
 .then((response: any) => {
            setActivityTypes((oldArray: any) => [
              ...oldArray,
              {[item.channelSettingTypeId]: response.settingValue},
            ]);
          });

You want to store each object from array of objects in single object ? — Muhammad Atif Akram, Jun 12 '22 at 07:08
[kindly check this link, I think it is helpful for you](https://stackoverflow.com/questions/37435334/correct-way-to-push-into-state-array) — Abdul Munim, Jun 12 '22 at 07:17
@Jerin Just added answer. Please check that. Its pretty simple — Muhammad Atif Akram, Jun 12 '22 at 07:18

SSM · Answer 1 · 2022-06-12T07:18:28.873

You can reduce the array of objects into an object.

You can do it by spreading (...) the current object into the resultant object, as shown below:

const 
  arrOfObjs = [{ ActFollow: "BlN" }, { ActSendGift: "BlY" }, { ActSubscribe: "BlY" }],
  obj = arrOfObjs.reduce((res, o) => ({ ...res, ...o }), {});

console.log(obj);

You can also do it using Object.assign, as shown below:

const 
  arrOfObjs = [{ ActFollow: "BlN" }, { ActSendGift: "BlY" }, { ActSubscribe: "BlY" }],
  obj = arrOfObjs.reduce((res, o) => Object.assign(res, o), {});

console.log(obj);

score 1 · Answer 2 · answered Jun 12 '22 at 07:16

1

How about this, if the nesting is only one level deep

const data = [{ActFollow: 'BlN',ActSendGift: 'BlY', ActSubscribe: 'BlY'}]

console.log([{...data[0],"hey" : "world"}])

answered Jun 12 '22 at 07:16

KcH

3,302
3
21
46

score 1 · Answer 3 · answered Jun 12 '22 at 07:17

const items = [{ActFollow: 'BlN'},{ActSendGift: 'BlY'},{ActSubscribe: 'BlY'}]

let object = {}
items.forEach(item=>{
  for (const [key, value] of Object.entries(item)) {
    object = {
      ...object,
      [key]: value
    }
  }
})
console.log(object)

You can use this simple idea in React also. Just hold on the default empty object in state and update the object.

score 0 · Answer 4 · answered Jun 12 '22 at 07:50

0

Use Spread Operator

const items = [{ActFollow: 'BlN', Anurag: 26},{ActSendGift: 'BlY'},{ActSubscribe: 'BlY'}]
    let obj ={}
    items.forEach((item) => {
      obj = {
        ...obj,
        ...item
        }
      })
    console.log(obj)

answered Jun 12 '22 at 07:50

Anurag Tripathi

784
1
13
13

How can I store previous values instead of storing the value in array of objects in react state

4 Answers4