Bind functions to events in React

Print.js

import React from 'react';

export default class Print extends React.Component {
  constructor() {
    super()
    
    this.printStuff = this.printStuff.bind(this);
  }

  printStuff() {
    console.log('It works! :)');
  }

  render() {
    return(
      <button onClick={this.printStuff}>click</button>
    );
  }
}