Update Reschedule and Clear functions, create Destroy function.
'use strict'

function ReInterval (callback, interval, args) {
  var self = this;

  this._callback = callback;
  this._args = args;

  this._interval = setInterval(callback, interval, this._args);

  this.reschedule = function (interval) {
    // if no interval entered, use the interval passed in on creation
    if (!interval)
      interval = self._interval;

    if (self._interval)
      clearInterval(self._interval);
    self._interval = setInterval(self._callback, interval, self._args);
  };

  this.clear = function () {
    if (self._interval) {
      clearInterval(self._interval);
      self._interval = undefined;
    }
  };
  
  this.destroy = function () {
    if (self._interval) {
      clearInterval(self._interval);
    }
    self._callback = undefined;
    self._interval = undefined;
    self._args = undefined;
  };
}

function reInterval () {
  if (typeof arguments[0] !== 'function')
    throw new Error('callback needed');
  if (typeof arguments[1] !== 'number')
    throw new Error('interval needed');

  var args;

  if (arguments.length > 0) {
    args = new Array(arguments.length - 2);

    for (var i = 0; i < args.length; i++) {
      args[i] = arguments[i + 2];
    }
  }

  return new ReInterval(arguments[0], arguments[1], args);
}

module.exports = reInterval;

'use strict'

function ReInterval (callback, interval, args) {
  var self = this;

  this._callback = callback;
  this._args = args;

  this._interval = setInterval(callback, interval, this._args);

  this.reschedule = function (interval) {

    var now = Date.now();
    if (self._interval)
      clearInterval(self._interval);
    self._interval = setInterval(self._callback, interval, self._args);
  };

  this.clear = function () {
    if (self._interval) {
      clearInterval(self._interval);
      self._interval = undefined;
      self._callback = undefined;
      self._args = undefined;
    }
  };
}

function reInterval () {
  if (typeof arguments[0] !== 'function')
    throw new Error('callback needed');
  if (typeof arguments[1] !== 'number')
    throw new Error('interval needed');

  var args;

  if (arguments.length > 0) {
    args = new Array(arguments.length - 2);

    for (var i = 0; i < args.length; i++) {
      args[i] = arguments[i + 2];
    }
  }

  return new ReInterval(arguments[0], arguments[1], args);
}

module.exports = reInterval;
