examples from Udemy ReactJS course @ https://www.udemy.com/learn-and-understand-reactjs
Lecture 12: Lists of Nested Components
Lecture 20: Passing down function to child with onClick (Dropdown/Button)
Lecture 22: Dropdown
Lecture 23: Confusing click-handling example. REVIEW THIS.
Lecture 30: in app.jsx, , (state passed as a prop),
and in list.jsx, accessed as a prop: this.props.items
Lecture 49: at 5:30 - problems with architecture that leader to router, Flux, etc.
* can't pass data to sibling