Repeat After Each Second In React | Update State After Certain Interval | React JS Tutorial

Repeat something after each second in React. Update react state after certain interval. Call function after each second in react. Automatically call function in react js.

You can use setInterval to trigger something to happen in React JS and then repeat the action for as long as, interval is not cleared. You can trigger time interval when react component gets loaded or mounted. But if you start time interval, you have to clear it before component unloads or unmounts. Clearing time interval is necessary before react unmounting component, to avoid glitch or to save app performance. Whenever you start time interval, always clear it when it or it's component is no longer needed.

Let's say you are creating a ticking clock, stop watch, live examination session, time recorder, count down, count up, or similar application or you want to repeat some action, present in a function after certain time period. Perhaps you want to call a function after each second.

Whatever the case may be, react js is efficient to perform time based actions. React will only target that node in virtual DOM and keep applying changes after time interval has been set. React can go on and keep repeating action if you want it to.

In this video, I have set the counter, to be incremented by 1, after each second. Basically after each second, a function is triggered to update the react state. State change then, gets reflected by the node that is pointing towards the data in state. We will use componentDidMount, componentWillUnmount, setInterval, clearInterval and prevState in this example.

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