React - Render a certain number of components dynamically

Question

I would like to display a number of the component Star (MUI component) based on the number of points the user has earned (this.state.points).

I don't know how to do this.

import React, { Component } from "react";
import { Star } from "@material-ui/icons";

Points extends Component {
  constructor(props) {
  super(props);
    this.state = {
      points: 6
    };
  }

  render() {
     return (
       <div>
         <p>
           + {this.state.points} points
           <Star />
         </p>
       </div>
     );
    }
  }

export default Points;

Answer 1

You can use Array.fill to create new Array with this.state.points number of empty slots which you then fill with the <Star /> component like so:

import React, { Component } from "react";
import { Star } from "@material-ui/icons";

class Points extends Component {
  constructor(props) {
    super(props);
    this.state = {
      points: 6
    };
  }

  render() {
    return (
      <div>
        <p>
          + {this.state.points} points
          // This is where the magic happens
          {Array(this.state.points).fill(<Star />)}
        </p>
      </div>
    );
  }
}

export default Points;

Here is a working Sandbox : https://codesandbox.io/s/vj3xpyn0x0

Answer 2

Try this

import React, { Component } from "react";
import { Star } from "@material-ui/icons";

Points extends Component {
constructor(props) {
super(props);
this.state = {
  points: 6
 };
}

render() {
 return (
   <div>
     <p>
       + {this.state.points} points

       {Array.from(Array(this.state.points)).map((x, index) => <Star key={index} />)}
     </p>
    </div>
  );
  }
}

export default Points;