React Classic Function Binding

ReactClassicFunctionBinding.js

/**
  * Classic function binding
  */

import React from 'react';

export default class CustomComponent extends React.Component {

  constructor(props) {
    super(props);
    this.classicBindingFunction = this.classicBindingFunction.bind(this);
  }

  classicBindingFunction() {
    console.log("This function needs to be bound in the constructor.")
  }

  render() {
    // ...
  }
}