counter-revealing-module.js

const counter = (function (argument) {
	let count = 0;

	const increase = () => {
		count++
	};

	const decrease = () => {
		count--
	};

	const getCount = () => count;

	const setCount = (newCount) => {
		count = newCount;
	};

	return {
		increase, 
		decrease,
		setCount,
		getCount
	};
})();

counter.setCount(5);
counter.increase();
counter.decrease();
counter.decrease();

console.log('Curr count: ', counter.getCount());