Handling events with React elements is very similar to handling events on DOM elements. But there are some syntax differences. React uses camelCase to define events such as onClick.
When you define a component using an ES6 class, a common pattern is for an event handler to be a method on the class.
You have to be careful about the meaning of `this` in JSX callbacks. In JavaScript, class methods are not bound by default. If you forget to bind `this.handleClick` and pass it to `onClick`, `this` will be `undefined` when the function is actually called.
This is not React-specific behavior; it is a part of how functions work in JavaScript. Generally, if you refer to a method without `()` after it, such as `onClick={this.handleClick}`, you should bind that method.
This is yet another reason why using function-based components instead of class-based is now recommended by React.
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