Can you explain "this.intervals=null" in the App.js file? Exercise 4/7


I was under the impression that the only things that need to be declared in a constructor are this.state and binding methods. So i can’t understand why this.intervals has been declared here. Is it arbitrarily declared or is “intervals” a pre-defined object in React.components with certain properties that can be called on?


where did you get this impression? Do you understand what the constructor does?

interval is part of Javascript. But declaring the interval in the constructor gives us a way to verify that the timer hasn’t been started yet.


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