将字符串数组映射到React-Native / ES6中的组件状态

Question

I have a component like this:

export default class Demo extends Component{
    constructor(props){
        super(props)
        this.state = {
           str1: '',
           str2: '',
           str3: '',
           str4: '',
        }
    }

........
}

And the string is like aaa-bbb-ccc-dd

How can I split them and add to the component state. My goal is something like:

str1: 'aaa',
str2: 'bbb',
str3: 'ccc',
str4: 'dd'

Answer 1

Create a new object using reduce and then use this.setState() to finally set the state in just one simple movement.

Also notice that it is more performant to set the state just once and use the function provided by react. Setting the state directly like state[bar] = foo is a bad practice as the documentation says

let string = "aaa-bbb-ccc-dd";

const newState = string.split('-').reduce((a, c, i) => {
    a[`str${i+1}`] = c;
    return a;
}, {})

this.setState(newState)

Answer 2

Try

 let s = "aaa-bbb-ccc-dd"; let state = {} s.split('-').forEach((x,i)=> state[`str${i+1}`]=x ) console.log(state); // and set state using this.setState(state) 

Answer 3

Something like the following should work:

const str = "aaa-bbb-ccc-dd"; 
const arr = srt.split("-");   
this.setState({str1 : arr[0],str2 : arr[1], str3: arr[2], str4 : arr[3]});