Why is it necessary to use bind when working with ES6 and ReactJS?

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one of the purpose of bind in React ES6 classes is that you have to bind manually.

No Autobinding

Methods follow the same semantics as regular ES6 classes, meaning that >they don’t automatically bind this to the instance. You’ll have to >explicitly use .bind(this) or arrow functions =>:

We recommend that you bind your event handlers in the constructor so they >are only bound once for every instance:

constructor(props) {
  super(props);
  this.state = {count: props.initialCount};
  this.tick = this.tick.bind(this);  // manually binding in constructor
}

you can read more from the docs: https://facebook.github.io/react/docs/reusable-components.html

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