How to use the increment operator in React

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setState is an async function. React may batch a bunch of setStates together.
So the value of this.state.count is the value at the time you make the request.

A better solutions to call a function that gets evaluated at the time the setState gets executed.

this.setState((prevState, props) => ({
    counter: prevState.counter + 1
}));

from https://facebook.github.io/react/docs/state-and-lifecycle.html

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