How Can I Access Updated State Values Immediately After Calling setState() in React?

React's State Propagation Conundrum

React's setState() method poses a challenge when trying to retrieve updated state values immediately after updating them. This is due to the asynchronous nature of setState().

Consider the following code:

let total = newDealersDeckTotal.reduce((a, b) => a + b, 0);

console.log(total, 'tittal'); // Outputs correct total
setTimeout(() => {
  this.setState({ dealersOverallTotal: total });
}, 10);

console.log(this.state.dealersOverallTotal, 'dealersOverallTotal1'); // Outputs incorrect total

The issue here is that the setState() call is asynchronous. This means that when the second console.log statement executes, the state has not yet been updated.

To address this, the callback pattern can be used. This involves passing a callback function to setState() that will be executed once the state change is complete:

this.setState({ dealersOverallTotal: total }, () => {
  console.log(this.state.dealersOverallTotal, 'dealersOverallTotal1');
});

By employing this approach, the console log statement will only execute after the state has been updated, ensuring that the correct value is displayed.

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