React - Lists and Keys

In this episode, I explain how lists and keys are used in React.

Resources:
* https://github.com/davidwparker/programmingtil-react/tree/master/0017-lists-and-keys
* https://facebook.github.io/react/docs/lists-and-keys.html
*https://facebook.github.io/react/docs/reconciliation.html#recursing-on-children

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