no-unused-expressions：需要赋值或 function

Question

I'm new in full stack developing and I'm trying to code something to understand better frontend with React JS and Material UI. In this component, console give me this error at line 75( this.props.isFriend(handle) ) but I do not understand what is wrong.

componentDidMount(){
    const {
      profile: { handle }
    } = this.props;
    
    this.props.isFriend(handle);
  }

How can I do?

Answer 1

This line returns a value when it executes (probably a boolean), but it is not used, that's what the error message is telling you. You need to do something with the returned value.

Ex.

this.isFriend = this.props.isFriend(handle);