About

setInterval permits to execute a function at regulier interval.

Example

• Increment and log the variable i every 3 seconds. The intervalFunctionId is called a timerId. setTimeout uses the same timeId pool. It is used in the clearInterval function to stop the execution.

let i = 0;
intervalFunctionId = setInterval(()=>{
    i++;
    if (i<10) {
        console.log("Executed after "+i*3 +" seconds");
    }
}, 3000) // every 3 seconds

• Stop the interval function with a setTimeout after 9 seconds.

setTimeout(()=>{
    window.clearInterval(intervalFunctionId);
    console.log("Interval function "+intervalFunctionId +" was cleared");
}, 9000) // after 9 seconds