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The essence of the functional prop is that when the button is clicked, the function passed in by the App component is executed. Thus, child-to-parent communication is achieved.

Gain a thorough understanding of React’s new component style and learn to use the hooks API to write simpler and more elegant React code.

Running shallow tests on the below code I get errors due to .prop () returning undefined rather than the value corresponding to the prop key. Console output and a log of one of the objects follow ...