React JS - 错误 - 需要赋值或 function 调用，而是看到一个表达式 no-unused-expressions

Question

I am using Axios function, to return an API call to response data as below.

componentDidMount(){
 axios.get("https://api.covid19india.org/state_district_wise.json").then(response => {
      response.data 
      this.setState({stateData:response.data});
   });
}

But I am getting the below error while compiling. Expected an assignment or function call and instead saw an expression no-unused-expressions . When I remove the line respose.data , it is working. But not returning the result.

Please help

Answer 1

Change to:

axios.get("https://api.covid19india.org/state_district_wise.json").then(response=>{
    this.setState({stateData:response.data});
    return response.data ;
});

The code in {} of then(response => {/* function body */}) is the body of a function, and then returns the result of that function.