How to use spread operator or use prev state in React Native-CodePudding

When I press a button it should call a function and send data. I am using spread operator so that I can keep the prev data. The problem is that my starting state is {} and when I console.log the data I see that I have empty object in my data

const [prevState, setState] = React.useState({});


const handleBtnPress =(info)=>{
setState(prevState => [...prevState, info] );

}

console.log(prevState)

output:

[{}, 'some data', 'for each button press']

output I am hoping for

['some data', 'for each button press']

CodePudding user response：

The initial state should be an array. Change {} to []

const [prevState, setState] = React.useState([]);

CodePudding user response：

You are using using an object as initial state. And your expected output is an Array. Hence you should set initial state to an Array. Your code should be :

const [prevState, setState] = React.useState([]);