Class to simplify management of intervals

Class-IntervalManager.js

function IntervalManager() {
  this.intervals = [];

  // Public
  this.setInterval = function(callback, interval, name) {
    if (!name) {
      name = "" + Date.now() + "|" + Math.random();
    }
    var newInterval = {
      'name': name,
      'callback': callback,
      'interval': interval,
      'enabled' : true,
      'lastRun' : 0
    };
    for(var i = 0; i < this.intervals.length; i++) {
      if (this.intervals[i].name == name) {
        this.intervals[i] = newInterval;
        return;
      }
    }
    this.intervals.arrayPush(newInterval);
  };

  this.clearInterval = function(name) {
    if (!name) {
      return false;
    }
    var startLen = this.intervals.length;
    this.intervals = this.intervals.filter(function(obj) {
      return obj.name != name;
    });
    if (startLen > this.intervals.length) {
      return true;
    }
    return false;
  };

  this.enableInterval = function(name) {
    var changed = 0;
    for (var i = 0; i < this.intervals.length; i++) {
      if (!name || this.intervals[i].name == name) {
        this.intervals[i].enabled = true;
        if (name) {
          return true;
        } else {
          changed++;
        }
      }
    }
    if (changed) {
      return true;
    }
    return false;
  };

  this.disableInterval = function(name) {
    var changed = 0;
    for (var i = 0; i < this.intervals.length; i++) {
      if (!name || this.intervals[i].name == name) {
        this.intervals[i].enabled = false;
        if (name) {
          return true;
        } else {
          changed++;
        }
      }
    }
    if (changed) {
      return true;
    }
    return false;
  };

  // Private
  this.loop = function() {
    var tick = Date.now();
    for (var i = 0; i < this.intervals.length; i++) {
      if (!this.intervals[i].enabled) {
        continue;
      }
      if (tick - this.intervals[i].lastRun > this.intervals[i].interval) {
        this.intervals[i].callback();
        this.intervals[i].lastRun = tick;
      }
    }
    setTimeout(function(that) {
      that.loop();
    }, 1000, this);
  };
  this.loop();
};