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390885 (23) [Avatar] Offline
#1
Page 72 Listing 4-4
This in the callback in setInterval function is dynamic.
It will result in that this.setState becomes undefined.
Replacing the callback with the arrow function snippet on page 71 will fix the problem.
Azat Mardan (41) [Avatar] Offline
#2
Should be fixed now. Thanks

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Azat, author of React Quickly