Singleton-Pattern.js

exports.RunSingleton = function () {
  Printer = (() => {
    let instance = null;
    function createPrinter() {
      function print() {
        console.log("Print function", this);
      }
      function stop() {
        console.log("Stop printer", this);
      }
      return {
        print: print,
        stop: stop
      }
    }
    function getInstance() {
      if (!instance) {
        instance = createPrinter();
      }
      return instance;
    }
    return {
      getInstance: getInstance
    }
  })();
  var printerInstance = Printer.getInstance();
  printerInstance.print()
  printerInstance.stop()
}