Ok, so I'm so frustrated finding the right solution so I'm posting the problem here. Giving an answer would help me a lot, coz I'm stuck!
the state tree looks like this
this.state = {
itemList : [{
_id : 1234,
description : 'This the description',
amount : 100
}, {
_id : 1234,
description : 'This the description',
amount : 100
}],
}
The problems are :
This is how you would use setState and prevstate to update a certain attribute of an object in your data structure.
this.setState(prevState => ({
itemList: prevState.itemList.map(
obj => (obj._id === 1234 ? Object.assign(obj, { description: "New Description" }) : obj)
)
}));
import React, { useState } from 'react';
const App = () => {
const [data, setData] = useState([
{
username: '141451',
password: 'password',
favoriteFood: 'pizza',
},
{
username: '15151',
password: '91jf7jn38f8jn3',
favoriteFood: 'beans'
}
]);
return (
<div>
{data.map(user => {
return (
<div onClick={() => {
setData([...data].map(object => {
if(object.username === user.username) {
return {
...object,
favoriteFood: 'Potatos',
someNewRandomAttribute: 'X'
}
}
else return object;
}))
}}>
{JSON.stringify(user) + '\n'}
</div>
)
})}
</div>
)
}