Singleton - Pattern

singleton.js

"use strict";

var Singleton = (function () {
  function ProcessManager() {
    this.numProcess = 0;
  }

  var processManager = undefined;
  var createProcessManager = function createProcessManager() {
    processManager = new ProcessManager();
  };

  return {
    getProcessManager: function getProcessManager() {
      if (!processManager) {
        createProcessManager();
      }

      return processManager;
    }
  };
})();

var pm = Singleton.getProcessManager();
var pm2 = Singleton.getProcessManager();

console.log(pm === pm2);