Promised Interval

example.js

const interval = new PromisedInterval(async () => {

    //Do something here

}, 5000);

// Start the loop running
interval.start(); // you can await this if you'd like to pause until something stops the interval

// Pause the execution after the current loop finishes
interval.stop();

// Change the loop timer
interval.setInterval(8000);

// Start the loop again
interval.start();

promised-interval.js

class PromisedInterval {

  constructor(handler, interval) {
    this.setHandler(handler);
    this.setInterval(interval);
    this.running = false;
  }

  setInterval(interval) {
    this.interval = interval;
  }

  setHandler(handler) {
    this.handler = handler;
  }

  async start() {
    this.running = true;
    while (this.running) {
      await this.loop();
    }
  }

  stop() {
    this.running = false;
  }

  async loop() {
    const runStartTimestamp = Date.now();
    await this.handler();
    const runDifference = Date.now() - runStartTimestamp;
    const timeUntilNextLoop = this.interval - runDifference;
    return new Promise(resolve => setTimeout(resolve, timeUntilNextLoop));
  }
}

export default PromisedInterval;