A class that runs a function on an interval. An instance of this class can be passed to many controllers, but only one interval will ever be set.

gistfile1.js

var RingOfPower = function (action, freq) {
  if (typeof action === "undefined" || typeof freq === "undefined") {
    throw new Error("must provide a function  and an interval");
  }
  this.action = action;
  this.frequency = freq;
};

RingOfPower.prototype.wield = function () {
  clearInterval(this.interval);
  this.interval = setInterval(this.action, this.frequency);
};

RingOfPower.prototype.conceal = function () {
  clearInterval(this.interval);
};