Shows a basic implementation of a JavaScript class which can utilize private members while having a publicly accessible interface.

privateClass.js

let Klass = (function () {

	// To add private members using a WeakMap, check out the link below.
	// https://developer.mozilla.org/en-US/Add-ons/SDK/Guides/Contributor_s_Guide/Private_Properties
	
	function foo (params) {
		// Code
	}

	class Klass {

		constructor(params = {default}) {

			try {
				foo()
			} catch (exception) {
				return exception
			}

		}

	}

	return Klass

})()

export default Klass