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In Projects, you can keep track of your progress as you go throught the tasks. Check each item as you complete it!


There are two categories that we haven't yet discussed: updating and unmounting lifecycle methods. This lesson covers both.

What is updating?

The first time that a component instance renders, it does not update. A component updates every time that it renders, starting with the second render.

There are five updating lifecycle methods:

  • componentWillReceiveProps
  • shouldComponentUpdate
  • componentWillUpdate
  • render
  • componentDidUpdate

Whenever a component instance updates, it automatically calls all five of these methods, in order.

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