javascript - Prevent Multiple Instances for SetInterval

Question

What is the most recommended/best way to stop multiple instances of a setInterval function from being created (in javascript) and call it only once?

Answer 1

setInterval returns an interval id you can use to check to see if it's already been instantiated. For example:

let intervalId

const someFunction = () => {
  intervalId = setInterval(someOtherFunction, 1000)
}

const someThirdFunction () => {
  if (!intervalId) {
    intervalId = setInterval(someOtherFunction, 1000)
  }
}