How to add a new key value to react js state array?

Question

I want to add new key value to array ınto state? I tell you what I want to do below. How can I do that? 1. Start state in consruture method

`this.state = {
          


        

Answer 1

I think This will meet the above scenario.

const newFile = this.state.files.map((file) => {

    return {...file, key4: val4};
});
this.setState({files: newFile });