Update your code to use ES2015 (ES6)

[glortho]

Looking through your code I see places where you can use the following ES6 features:

• Shortened method definitions
• Arrow functions (if not for issues around this, at least for more concise code)
• Block-scoped variables: const and let. Note: Use const except when you absolutely need let.
• Classes: React offers the React.Component parent class. Warning: After you switch to classes this is no longer automatically bound! Read up on this with regards to React "autobinding."
• Rest/spread: You can use this at least in the context of passing down state/props, if not elsewhere.
• Module exports

Optional: Destructuring.