Задержка throttle

 function throttle(func, limit) {
    let lastFunc
    let lastRan
    return function() {
      const context = this
      const args = arguments
      if (!lastRan) {
        func.apply(context, args)
        lastRan = Date.now()
      } else {
        clearTimeout(lastFunc)
        lastFunc = setTimeout(function() {
          if ((Date.now() - lastRan) >= limit) {
            func.apply(context, args)
            lastRan = Date.now()
          }
        }, limit - (Date.now() - lastRan))
      }
    }
  }