A ticker class encapsulating setInterval

ticker.ts

/**
 * Usage:
 *    new Ticker(timeout: number, (stop: Function) => {
 *      // do stuff every timeout
 *      if (...) {stop()}
 *    })
 */
class Ticker {
  private ticker: any
  private handler: Function
  private timeout: number

  constructor(timeout: number, handler: Function) {
    this.ticker = null
    this.handler = handler
    this.timeout = timeout
  }

  handle() {
    this.handler(this.stop.bind(this))
  }

  start() {
    if (!this.ticker) {
      log("ticker start")
      setTimeout(() => this.handle(), 1000) // first exec after 1sec
      this.ticker = setInterval(() => this.handle(), this.timeout)
    }
  }

  stop() {
    if (this.ticker) {
      log("ticker stop")
      clearInterval(this.ticker)
      this.ticker = null
    }
  }
}